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Cheap Li-Ion batteries 8000mah on ebay?
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Bill Bowden
Nov 18, 2015, 10:45:15 PM11/18/15
to
Are these batteries good? Seems cheap for an 8 amp-hour Li-Ion battery. You
get two for $7.77 plus $2 shipping, or maybe $5 apiece..
http://www.ebay.com/itm/2Pcs-26650-8000mAh-3-7v-Li-ion-Rechargeable-Battery-Cell-For-Electric-Tools-/111819891266?hash=item1a08fc2242:g:AfoAAOSw14xWKZ1t
DESCRIPTION:
Quantity:2
Standard voltage is 3.7V,
the voltage of full charge & empty condition is 4.2v & 2.5v respectively
Particularly suitable for flashlight, electric tools, electric bicycles,
electric vehicles
Capacity: 8000mAh
Voltage: 3.7V
Material: Li-ion
Max Charge voltage: 4.20 กเ 0.05V
Dimension: 67 mm (H)x 26 mm (Dia)
Color:Green
Package included:
2x UltraFire Green 26650 8000mAh Batteries
--- news://freenews.netfront.net/ - complaints: ne...@netfront.net ---
get two for $7.77 plus $2 shipping, or maybe $5 apiece..
http://www.ebay.com/itm/2Pcs-26650-8000mAh-3-7v-Li-ion-Rechargeable-Battery-Cell-For-Electric-Tools-/111819891266?hash=item1a08fc2242:g:AfoAAOSw14xWKZ1t
DESCRIPTION:
Quantity:2
Standard voltage is 3.7V,
the voltage of full charge & empty condition is 4.2v & 2.5v respectively
Particularly suitable for flashlight, electric tools, electric bicycles,
electric vehicles
Capacity: 8000mAh
Voltage: 3.7V
Material: Li-ion
Max Charge voltage: 4.20 กเ 0.05V
Dimension: 67 mm (H)x 26 mm (Dia)
Color:Green
Package included:
2x UltraFire Green 26650 8000mAh Batteries
--- news://freenews.netfront.net/ - complaints: ne...@netfront.net ---
Clifford Heath
Nov 18, 2015, 11:04:54 PM11/18/15
to
On 19/11/15 14:45, Bill Bowden wrote:
> Are these batteries good? Seems cheap for an 8 amp-hour Li-Ion battery
They lie. The very best 26650 Li-Ion are the Panasonic NCR cells, which
> Are these batteries good? Seems cheap for an 8 amp-hour Li-Ion battery
are about 5000mAH. The Ultrafire cells would be typically 1/3 of that,
or 1600mAH. Likewise all the other *fire Chinese brands (TrustFire,
SureFire, CatchOnFire, etc).
Furthermore, there's a whole industry repackaging dead cells scavenged
from old equipment.
Clifford Heath.
. You
> get two for $7.77 plus $2 shipping, or maybe $5 apiece..
>
>
> http://www.ebay.com/itm/2Pcs-26650-8000mAh-3-7v-Li-ion-Rechargeable-Battery-Cell-For-Electric-Tools-/111819891266?hash=item1a08fc2242:g:AfoAAOSw14xWKZ1t
>
>
> DESCRIPTION:
> Quantity:2
> Standard voltage is 3.7V,
> the voltage of full charge & empty condition is 4.2v & 2.5v respectively
> Particularly suitable for flashlight, electric tools, electric bicycles,
> electric vehicles
> Capacity: 8000mAh
> Voltage: 3.7V
> Material: Li-ion
Adrian Jansen
Nov 19, 2015, 1:23:06 AM11/19/15
to
On 19/11/2015 1:45 PM, Bill Bowden wrote:
> Are these batteries good? Seems cheap for an 8 amp-hour Li-Ion battery. You
> get two for $7.77 plus $2 shipping, or maybe $5 apiece..
>
>
> http://www.ebay.com/itm/2Pcs-26650-8000mAh-3-7v-Li-ion-Rechargeable-Battery-Cell-For-Electric-Tools-/111819891266?hash=item1a08fc2242:g:AfoAAOSw14xWKZ1t
>
>
> DESCRIPTION:
> Quantity:2
> Standard voltage is 3.7V,
> the voltage of full charge & empty condition is 4.2v & 2.5v respectively
> Particularly suitable for flashlight, electric tools, electric bicycles,
> electric vehicles
> Capacity: 8000mAh
> Voltage: 3.7V
> Material: Li-ion
> Max Charge voltage: 4.20 ¡à 0.05V
> Are these batteries good? Seems cheap for an 8 amp-hour Li-Ion battery. You
> get two for $7.77 plus $2 shipping, or maybe $5 apiece..
>
>
> http://www.ebay.com/itm/2Pcs-26650-8000mAh-3-7v-Li-ion-Rechargeable-Battery-Cell-For-Electric-Tools-/111819891266?hash=item1a08fc2242:g:AfoAAOSw14xWKZ1t
>
>
> DESCRIPTION:
> Quantity:2
> Standard voltage is 3.7V,
> the voltage of full charge & empty condition is 4.2v & 2.5v respectively
> Particularly suitable for flashlight, electric tools, electric bicycles,
> electric vehicles
> Capacity: 8000mAh
> Voltage: 3.7V
> Material: Li-ion
> Dimension: 67 mm (H)x 26 mm (Dia)
> Color:Green
>
> Package included:
> 2x UltraFire Green 26650 8000mAh Batteries
>
>
>
>
>
>
>
>
> --- news://freenews.netfront.net/ - complaints: ne...@netfront.net ---
>
Chinese mAH are about as well defined as the currency.
> Color:Green
>
> Package included:
> 2x UltraFire Green 26650 8000mAh Batteries
>
>
>
>
>
>
>
>
> --- news://freenews.netfront.net/ - complaints: ne...@netfront.net ---
>
It seems that even the better ones quote figures which should be mWH,
not mAH. At 3.7 volts, it makes a difference of a factor 3.7, which
seems about right.
Spehro Pefhany
Nov 19, 2015, 2:41:41 AM11/19/15
to
On Wed, 18 Nov 2015 19:45:06 -0800, the renowned "Bill Bowden"
<bpe...@bowdenshobbycircuits.info> wrote:
Run away. The capacity is certainly way overstated.
Also, typically this type of supplier will cheaply airmail their
shoddy lithium cells by lying about the package contents.
It's only a matter of time before an aircraft is taken down by this
kind of B.S.
--sp
--
Best regards,
Spehro Pefhany
Amazon link for AoE 3rd Edition: http://tinyurl.com/ntrpwu8
Microchip link for 2015 Masters in Phoenix: http://tinyurl.com/l7g2k48
<bpe...@bowdenshobbycircuits.info> wrote:
Run away. The capacity is certainly way overstated.
Also, typically this type of supplier will cheaply airmail their
shoddy lithium cells by lying about the package contents.
It's only a matter of time before an aircraft is taken down by this
kind of B.S.
--sp
Best regards,
Spehro Pefhany
Amazon link for AoE 3rd Edition: http://tinyurl.com/ntrpwu8
Microchip link for 2015 Masters in Phoenix: http://tinyurl.com/l7g2k48
David Eather
Nov 19, 2015, 3:35:13 AM11/19/15
to
On Thu, 19 Nov 2015 14:04:46 +1000, Clifford Heath <no....@please.net>
wrote:
> On 19/11/15 14:45, Bill Bowden wrote:
>> Are these batteries good? Seems cheap for an 8 amp-hour Li-Ion battery
>
> They lie. The very best 26650 Li-Ion are the Panasonic NCR cells, which
> are about 5000mAH. The Ultrafire cells would be typically 1/3 of that,
> or 1600mAH. Likewise all the other *fire Chinese brands (TrustFire,
> SureFire, CatchOnFire, etc).
>
> Furthermore, there's a whole industry repackaging dead cells scavenged
> from old equipment.
>
> Clifford Heath.
No I think you exaggerate. I have never seen a *fire cell deliver 1/3 of
the printed capacity - I think it is normally even less!
Seriously to the OP, avoid *fire brands like the plague, apart from the
dodge capacity labels most of them don't last long either. They will
probably be the most expensive batteries you evet buy in terms of total
power delivered and it will let you down when you need it most.
wrote:
> On 19/11/15 14:45, Bill Bowden wrote:
>> Are these batteries good? Seems cheap for an 8 amp-hour Li-Ion battery
>
> They lie. The very best 26650 Li-Ion are the Panasonic NCR cells, which
> are about 5000mAH. The Ultrafire cells would be typically 1/3 of that,
> or 1600mAH. Likewise all the other *fire Chinese brands (TrustFire,
> SureFire, CatchOnFire, etc).
>
> Furthermore, there's a whole industry repackaging dead cells scavenged
> from old equipment.
>
> Clifford Heath.
the printed capacity - I think it is normally even less!
Seriously to the OP, avoid *fire brands like the plague, apart from the
dodge capacity labels most of them don't last long either. They will
probably be the most expensive batteries you evet buy in terms of total
power delivered and it will let you down when you need it most.
Jan Panteltje
Nov 19, 2015, 4:12:50 AM11/19/15
to
On a sunny day (Thu, 19 Nov 2015 18:35:09 +1000) it happened "David Eather"
<eat...@tpg.com.au> wrote in <op.x8b94vrlwei6gd@phenom-pc>:
>No I think you exaggerate. I have never seen a *fire cell deliver 1/3 of
>the printed capacity - I think it is normally even less!
>Seriously to the OP, avoid *fire brands like the plague, apart from the
>dodge capacity labels most of them don't last long either. They will
>probably be the most expensive batteries you evet buy in terms of total
>power delivered and it will let you down when you need it most.
Well, do you actually have one?
Here is mine, now in use for almost 2 years:
http://panteltje.com/pub/ultra_fire_batteries_and_flashlight_IMG_5158.JPG
And watch how well protected these are:
http://panteltje.com/pub/utra_fire_protected_against_almost_everything_IMG_5162.JPG
The flashlight melted at some point, but the batteries are still going strong.
I have not checked the capacity, but it sure did not go out prematurely,
One of these batteries that came with that flashlight has a bit more self-discharge, so I kept the good one in the flashlight,
and the bad one as spare, check the charge every now and then, came with charger too that actually works.
And I have no fear keeping this in my pocket.
And I'm sure it came by plane, how long does a steam boat from China take?
You aussies suffer from hanging upside down, Spero para-noia
ANYTHING can go wrong at any time, your chances of pilot error are bigger than from fire batteries.
;-)
My spell-sker insists aussies is spelled as pussies
<eat...@tpg.com.au> wrote in <op.x8b94vrlwei6gd@phenom-pc>:
>No I think you exaggerate. I have never seen a *fire cell deliver 1/3 of
>the printed capacity - I think it is normally even less!
>Seriously to the OP, avoid *fire brands like the plague, apart from the
>dodge capacity labels most of them don't last long either. They will
>probably be the most expensive batteries you evet buy in terms of total
>power delivered and it will let you down when you need it most.
Here is mine, now in use for almost 2 years:
http://panteltje.com/pub/ultra_fire_batteries_and_flashlight_IMG_5158.JPG
And watch how well protected these are:
http://panteltje.com/pub/utra_fire_protected_against_almost_everything_IMG_5162.JPG
The flashlight melted at some point, but the batteries are still going strong.
I have not checked the capacity, but it sure did not go out prematurely,
One of these batteries that came with that flashlight has a bit more self-discharge, so I kept the good one in the flashlight,
and the bad one as spare, check the charge every now and then, came with charger too that actually works.
And I have no fear keeping this in my pocket.
And I'm sure it came by plane, how long does a steam boat from China take?
You aussies suffer from hanging upside down, Spero para-noia
ANYTHING can go wrong at any time, your chances of pilot error are bigger than from fire batteries.
;-)
My spell-sker insists aussies is spelled as pussies
mike
Nov 19, 2015, 4:47:03 AM11/19/15
to
On 11/19/2015 1:12 AM, Jan Panteltje wrote:
> On a sunny day (Thu, 19 Nov 2015 18:35:09 +1000) it happened "David Eather"
> <eat...@tpg.com.au> wrote in <op.x8b94vrlwei6gd@phenom-pc>:
>
>> No I think you exaggerate. I have never seen a *fire cell deliver 1/3 of
>> the printed capacity - I think it is normally even less!
>> Seriously to the OP, avoid *fire brands like the plague, apart from the
>> dodge capacity labels most of them don't last long either. They will
>> probably be the most expensive batteries you evet buy in terms of total
>> power delivered and it will let you down when you need it most.
>
> Well, do you actually have one?
I have two identical flashlights.
> On a sunny day (Thu, 19 Nov 2015 18:35:09 +1000) it happened "David Eather"
> <eat...@tpg.com.au> wrote in <op.x8b94vrlwei6gd@phenom-pc>:
>
>> No I think you exaggerate. I have never seen a *fire cell deliver 1/3 of
>> the printed capacity - I think it is normally even less!
>> Seriously to the OP, avoid *fire brands like the plague, apart from the
>> dodge capacity labels most of them don't last long either. They will
>> probably be the most expensive batteries you evet buy in terms of total
>> power delivered and it will let you down when you need it most.
>
> Well, do you actually have one?
One has a *fire battery, the other has a cell retrieved from a
very old and very dead
laptop battery pack. The *fire light is dimmer from the outset.
I only use the *fire light when I can't find the other one
and it still gets charged about twice as often.
I bought two brand new, still in the shrink wrap, 4000maH Ultrafires
and a charger for 25-cents at a garage sale.
After using them, I want my quarter back.
And the charger charges two in parallel. If you insert cells with very
different state of charge, sparks ensue. I never left it in that condition,
so I don't know how warm things would get.
Jan Panteltje
Nov 19, 2015, 6:17:57 AM11/19/15
to
On a sunny day (Thu, 19 Nov 2015 01:46:11 -0800) it happened mike
<ham...@netzero.net> wrote in <n2k5m5$udv$1...@dont-email.me>:
>I have two identical flashlights.
>One has a *fire battery, the other has a cell retrieved from a
>very old and very dead
>laptop battery pack. The *fire light is dimmer from the outset.
>I only use the *fire light when I can't find the other one
>and it still gets charged about twice as often.
>
>I bought two brand new, still in the shrink wrap, 4000maH Ultrafires
>and a charger for 25-cents at a garage sale.
>After using them, I want my quarter back.
>And the charger charges two in parallel. If you insert cells with very
>different state of charge, sparks ensue. I never left it in that condition,
>so I don't know how warm things would get.
Well I really do not know,
2 years ago I posted this here
https://groups.google.com/forum/#!searchin/sci.electronics.design/Re$3A$209V$20Battery$20or$202$20x$20AAA$20with$209V$20Converter|sort:relevance/sci.electronics.design/DbgPnYXfGcY/KndUBmUUj7AJ
(scroll down, it says:):
"
here one of my flashlights, with battery out:
http://panteltje.com/pub/Cree_rechargable_flashlight_IMG_4478.JPG
Li-ion, rechargeable, 3.7V 3.2Ah, LED, has several brightness stages,
flashing mode too, came with charger.
I have several smaller Cree ones, those all have Eneloop AAA those,
and will still work a year after charging.
All ebay stuff.
The big Cree has as defect that it melted the plastic around the LED
when I left it on to test how long the battery lasted.
Now the beam looks a bit different...
"
So it delivered a real amount of power for a long time, the flashlight melted,
the batteries are still OK.
Fixed the flashlight, it was not properly assembled....
So far I have no complaints.
Since I took out the spare utra-fire battery just now,
I am recharging it in all by itself in that 2 x charger you mention
and that is still on.
No smoke from that area yet..
It was at 3.85 V, but OK..
Yes, sure I read those stories in the news of people getting burned to death or something using Li-ion or whatever...
There is one in every laptop?
Batteries is a consumable, I have plenty more problems with lead acid, be it sealed or
just normal car batteries, than with these Li-ions or lipos.
It is important that the flashlight works for a reasonable amount of time if you have not used it.
Since I DO use it more often .. I dunno, but this spare battery I am charging now
was still near almost? full, and that was a bad one.
I have eneloops in a smaller LED flashlight, those work OK too,
and are used several times a day, for example for inspection of stuff.
If yer life depends on it, then you need to keep several flashlights maybe with several battery technologies,
a fire maker, drinking water, gun to shoot deer, and of course your cellphone
to call for help.. ;-)
I do not normally buy at flee markets....
ebay is much better.
And that is my experience.
Maybe somebody should measure discharge times....
Maybe somebody has.
Still it may be different for different batches / sources.
<ham...@netzero.net> wrote in <n2k5m5$udv$1...@dont-email.me>:
>I have two identical flashlights.
>One has a *fire battery, the other has a cell retrieved from a
>very old and very dead
>laptop battery pack. The *fire light is dimmer from the outset.
>I only use the *fire light when I can't find the other one
>and it still gets charged about twice as often.
>
>I bought two brand new, still in the shrink wrap, 4000maH Ultrafires
>and a charger for 25-cents at a garage sale.
>After using them, I want my quarter back.
>And the charger charges two in parallel. If you insert cells with very
>different state of charge, sparks ensue. I never left it in that condition,
>so I don't know how warm things would get.
2 years ago I posted this here
https://groups.google.com/forum/#!searchin/sci.electronics.design/Re$3A$209V$20Battery$20or$202$20x$20AAA$20with$209V$20Converter|sort:relevance/sci.electronics.design/DbgPnYXfGcY/KndUBmUUj7AJ
(scroll down, it says:):
"
here one of my flashlights, with battery out:
http://panteltje.com/pub/Cree_rechargable_flashlight_IMG_4478.JPG
Li-ion, rechargeable, 3.7V 3.2Ah, LED, has several brightness stages,
flashing mode too, came with charger.
I have several smaller Cree ones, those all have Eneloop AAA those,
and will still work a year after charging.
All ebay stuff.
The big Cree has as defect that it melted the plastic around the LED
when I left it on to test how long the battery lasted.
Now the beam looks a bit different...
"
So it delivered a real amount of power for a long time, the flashlight melted,
the batteries are still OK.
Fixed the flashlight, it was not properly assembled....
So far I have no complaints.
Since I took out the spare utra-fire battery just now,
I am recharging it in all by itself in that 2 x charger you mention
and that is still on.
No smoke from that area yet..
It was at 3.85 V, but OK..
Yes, sure I read those stories in the news of people getting burned to death or something using Li-ion or whatever...
There is one in every laptop?
Batteries is a consumable, I have plenty more problems with lead acid, be it sealed or
just normal car batteries, than with these Li-ions or lipos.
It is important that the flashlight works for a reasonable amount of time if you have not used it.
Since I DO use it more often .. I dunno, but this spare battery I am charging now
was still near almost? full, and that was a bad one.
I have eneloops in a smaller LED flashlight, those work OK too,
and are used several times a day, for example for inspection of stuff.
If yer life depends on it, then you need to keep several flashlights maybe with several battery technologies,
a fire maker, drinking water, gun to shoot deer, and of course your cellphone
to call for help.. ;-)
I do not normally buy at flee markets....
ebay is much better.
And that is my experience.
Maybe somebody should measure discharge times....
Maybe somebody has.
Still it may be different for different batches / sources.
John Doe
Nov 19, 2015, 8:48:21 AM11/19/15
to
Someone who claims to be into technology should be able to quote more
than one level. Most of this stuff is a repeat of its prior post.
--
Jan Panteltje <pNaOnStPeAlMtje yahoo.com> wrote in news:n2kb4r$dcb$1 news.datemas.de:
> Path: eternal-september.org!mx02.eternal-september.org!feeder.eternal-september.org!weretis.net!feeder4.news.weretis.net!newsfeed.datemas.de!news.datemas.de!.POSTED!not-for-mail
> From: Jan Panteltje <pNaOnStPeAlMtje yahoo.com>
> Newsgroups: sci.electronics.design
> Subject: Re: Cheap Li-Ion batteries 8000mah on ebay?
> Date: Thu, 19 Nov 2015 11:17:47 GMT
> Organization: Datemas.de http://www.news.datemas.de
> Lines: 70
> Message-ID: <n2kb4r$dcb$1 news.datemas.de>
> References: <n2jgk4$1fct$1 adenine.netfront.net> <ATb3y.185305$rR1.78820 fx19.iad> <op.x8b94vrlwei6gd phenom-pc> <n2k3qc$tac$1 news.datemas.de> <n2k5m5$udv$1 dont-email.me>
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> X-Complaints-To: abuse datemas.de
> NNTP-Posting-Date: Thu, 19 Nov 2015 11:17:47 +0000 (UTC)
> User-Agent: NewsFleX-1.5.7.4 (Linux-2.6.37.6-smp)
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> Xref: mx02.eternal-september.org sci.electronics.design:391860
than one level. Most of this stuff is a repeat of its prior post.
--
Jan Panteltje <pNaOnStPeAlMtje yahoo.com> wrote in news:n2kb4r$dcb$1 news.datemas.de:
> Path: eternal-september.org!mx02.eternal-september.org!feeder.eternal-september.org!weretis.net!feeder4.news.weretis.net!newsfeed.datemas.de!news.datemas.de!.POSTED!not-for-mail
> From: Jan Panteltje <pNaOnStPeAlMtje yahoo.com>
> Newsgroups: sci.electronics.design
> Subject: Re: Cheap Li-Ion batteries 8000mah on ebay?
> Date: Thu, 19 Nov 2015 11:17:47 GMT
> Organization: Datemas.de http://www.news.datemas.de
> Lines: 70
> Message-ID: <n2kb4r$dcb$1 news.datemas.de>
> References: <n2jgk4$1fct$1 adenine.netfront.net> <ATb3y.185305$rR1.78820 fx19.iad> <op.x8b94vrlwei6gd phenom-pc> <n2k3qc$tac$1 news.datemas.de> <n2k5m5$udv$1 dont-email.me>
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> Xref: mx02.eternal-september.org sci.electronics.design:391860
>
> On a sunny day (Thu, 19 Nov 2015 01:46:11 -0800) it happened mike
> <ham789 netzero.net> wrote in <n2k5m5$udv$1 dont-email.me>:
> On a sunny day (Thu, 19 Nov 2015 01:46:11 -0800) it happened mike
John Doe
Nov 19, 2015, 8:52:12 AM11/19/15
to
You need to exercise extreme discretion. Think "brand-name" and
"reputable seller". That is a no-brainer when buying such items from
Fleabay. Even so when buying from Amazon, Amazon allows counterfeit
sellers left and right.
"reputable seller". That is a no-brainer when buying such items from
Fleabay. Even so when buying from Amazon, Amazon allows counterfeit
sellers left and right.
Jan Panteltje
Nov 19, 2015, 9:48:27 AM11/19/15
to
On a sunny day (Thu, 19 Nov 2015 13:45:54 -0000 (UTC)) it happened John Dodo
<alway...@message.header> wrote in <n2kjqh$f6a$2...@dont-email.me>:
>Someone who claims to be into technology should be able to quote more
>than one level. Most of this stuff is a repeat of its prior post.
I post from experience with thrse batteries,
something you do not seem to have and so should shut the f*ck up.
At the most I can see you as an undercover agent for 'brand name' batteries.
BTW 'brand' in Dutch means: FIRE.
Or maybe you also walk with head down there under?
<alway...@message.header> wrote in <n2kjqh$f6a$2...@dont-email.me>:
>Someone who claims to be into technology should be able to quote more
>than one level. Most of this stuff is a repeat of its prior post.
something you do not seem to have and so should shut the f*ck up.
At the most I can see you as an undercover agent for 'brand name' batteries.
BTW 'brand' in Dutch means: FIRE.
Or maybe you also walk with head down there under?
Bill Bowden
Nov 19, 2015, 5:07:42 PM11/19/15
to
"Adrian Jansen" <adr...@qq.vv.net> wrote in message
news:564d6ac6$0$1596$c3e8da3$5496...@news.astraweb.com...
> On 19/11/2015 1:45 PM, Bill Bowden wrote:
>> Are these batteries good? Seems cheap for an 8 amp-hour Li-Ion battery.
>> You
>> get two for $7.77 plus $2 shipping, or maybe $5 apiece..
>>
>>
>> http://www.ebay.com/itm/2Pcs-26650-8000mAh-3-7v-Li-ion-Rechargeable-Battery-Cell-For-Electric-Tools-/111819891266?hash=item1a08fc2242:g:AfoAAOSw14xWKZ1t
>>
>>
>> DESCRIPTION:
>> Quantity:2
>> Standard voltage is 3.7V,
>> the voltage of full charge & empty condition is 4.2v & 2.5v respectively
>> Particularly suitable for flashlight, electric tools, electric bicycles,
>> electric vehicles
>> Capacity: 8000mAh
>> Voltage: 3.7V
>> Material: Li-ion
>> Max Charge voltage: 4.20 กเ 0.05V
>> Are these batteries good? Seems cheap for an 8 amp-hour Li-Ion battery.
>> You
>> get two for $7.77 plus $2 shipping, or maybe $5 apiece..
>>
>>
>> http://www.ebay.com/itm/2Pcs-26650-8000mAh-3-7v-Li-ion-Rechargeable-Battery-Cell-For-Electric-Tools-/111819891266?hash=item1a08fc2242:g:AfoAAOSw14xWKZ1t
>>
>>
>> DESCRIPTION:
>> Quantity:2
>> Standard voltage is 3.7V,
>> the voltage of full charge & empty condition is 4.2v & 2.5v respectively
>> Particularly suitable for flashlight, electric tools, electric bicycles,
>> electric vehicles
>> Capacity: 8000mAh
>> Voltage: 3.7V
>> Material: Li-ion
>> Dimension: 67 mm (H)x 26 mm (Dia)
>> Color:Green
>>
>> Package included:
>> 2x UltraFire Green 26650 8000mAh Batteries
>>
>> Color:Green
>>
>> Package included:
>> 2x UltraFire Green 26650 8000mAh Batteries
>>
> Chinese mAH are about as well defined as the currency.
>
> It seems that even the better ones quote figures which should be mWH, not
> mAH. At 3.7 volts, it makes a difference of a factor 3.7, which seems
> about right.
Yes, that seems about right mWH instead of mAH. I went shopping at Fry's
>
> It seems that even the better ones quote figures which should be mWH, not
> mAH. At 3.7 volts, it makes a difference of a factor 3.7, which seems
> about right.
today and couldn't find any LI batteries over 2500mAH and they were 12
bucks each. I did see a new item I hadn't seen before. A 10,000 mAH 'D' NiMh
cell for 10 bucks. It was in a package of 2 for $19.95. But I already have
several 4000 mAH Ni-Cad 'D' cells that still work. I see a lot of used cell
phone batteries at swap meets for $1 each, so I could parallel 2 or 3 to get
a higher capacity.
. . .
David Eather
Nov 19, 2015, 7:27:44 PM11/19/15
to
On Thu, 19 Nov 2015 19:12:43 +1000, Jan Panteltje
<pNaOnSt...@yahoo.com> wrote:
> On a sunny day (Thu, 19 Nov 2015 18:35:09 +1000) it happened "David
> Eather"
> <eat...@tpg.com.au> wrote in <op.x8b94vrlwei6gd@phenom-pc>:
>
>> No I think you exaggerate. I have never seen a *fire cell deliver 1/3 of
>> the printed capacity - I think it is normally even less!
>> Seriously to the OP, avoid *fire brands like the plague, apart from the
>> dodge capacity labels most of them don't last long either. They will
>> probably be the most expensive batteries you evet buy in terms of total
>> power delivered and it will let you down when you need it most.
>
> Well, do you actually have one?
I was stupid enough to buy 3 sets of *fire over the years. One set of 4
<pNaOnSt...@yahoo.com> wrote:
> On a sunny day (Thu, 19 Nov 2015 18:35:09 +1000) it happened "David
> Eather"
> <eat...@tpg.com.au> wrote in <op.x8b94vrlwei6gd@phenom-pc>:
>
>> No I think you exaggerate. I have never seen a *fire cell deliver 1/3 of
>> the printed capacity - I think it is normally even less!
>> Seriously to the OP, avoid *fire brands like the plague, apart from the
>> dodge capacity labels most of them don't last long either. They will
>> probably be the most expensive batteries you evet buy in terms of total
>> power delivered and it will let you down when you need it most.
>
> Well, do you actually have one?
NiMh AA's (I know we are talking about LiPo here but this is just for
illustration) had no usable cells. 2 of the batteries charge once or twice
to a few mA/Hrs the others were dead shorts or immediately rejected by my
charger. The other sets (of various types)were better, but not by much.
>
> Here is mine, now in use for almost 2 years:
> http://panteltje.com/pub/ultra_fire_batteries_and_flashlight_IMG_5158.JPG
>
> And watch how well protected these are:
> http://panteltje.com/pub/utra_fire_protected_against_almost_everything_IMG_5162.JPG
>
> The flashlight melted at some point, but the batteries are still going
> strong.
>
> I have not checked the capacity, but it sure did not go out prematurely,
> One of these batteries that came with that flashlight has a bit more
> self-discharge, so I kept the good one in the flashlight,
> and the bad one as spare, check the charge every now and then, came with
> charger too that actually works.
>
> And I have no fear keeping this in my pocket.
>
> And I'm sure it came by plane, how long does a steam boat from China
> take?
>
>
> You aussies suffer from hanging upside down, Spero para-noia
>
> ANYTHING can go wrong at any time, your chances of pilot error are
> bigger than from fire batteries.
>
> ;-)
>
> My spell-sker insists aussies is spelled as pussies
legg
Nov 19, 2015, 7:34:30 PM11/19/15
to
On Wed, 18 Nov 2015 19:45:06 -0800, "Bill Bowden"
<bpe...@bowdenshobbycircuits.info> wrote:
>Are these batteries good? Seems cheap for an 8 amp-hour Li-Ion battery. You
>get two for $7.77 plus $2 shipping, or maybe $5 apiece..
>
>
>http://www.ebay.com/itm/2Pcs-26650-8000mAh-3-7v-Li-ion-Rechargeable-Battery-Cell-For-Electric-Tools-/111819891266?hash=item1a08fc2242:g:AfoAAOSw14xWKZ1t
>
>
Some batteries of this brand name are reviewed and dissassembled on
<bpe...@bowdenshobbycircuits.info> wrote:
>Are these batteries good? Seems cheap for an 8 amp-hour Li-Ion battery. You
>get two for $7.77 plus $2 shipping, or maybe $5 apiece..
>
>
>http://www.ebay.com/itm/2Pcs-26650-8000mAh-3-7v-Li-ion-Rechargeable-Battery-Cell-For-Electric-Tools-/111819891266?hash=item1a08fc2242:g:AfoAAOSw14xWKZ1t
>
>
thi website:
http://www.lygte-info.dk/info/indexBatteriesAndChargers UK.html
They don't come off well.
Some samples had evidence of pre-use in other application formats.
RL
Clifford Heath
Nov 20, 2015, 1:44:12 AM11/20/15
to
On 19/11/15 19:35, David Eather wrote:
> On Thu, 19 Nov 2015 14:04:46 +1000, Clifford Heath <no....@please.net>
> wrote:
>> On 19/11/15 14:45, Bill Bowden wrote:
>>> Are these batteries good? Seems cheap for an 8 amp-hour Li-Ion battery
>> They lie. The very best 26650 Li-Ion are the Panasonic NCR cells,
>> which are about 5000mAH. The Ultrafire cells would be typically 1/3 of
>> that, or 1600mAH. Likewise all the other *fire Chinese brands
>> (TrustFire, SureFire, CatchOnFire, etc).
>> Furthermore, there's a whole industry repackaging dead cells scavenged
>> from old equipment.
>> Clifford Heath.
> No I think you exaggerate. I have never seen a *fire cell deliver 1/3 of
> the printed capacity - I think it is normally even less!
I have three pairs of *fire 18650's that do 1200mAH, whereas the NCRs do
> On Thu, 19 Nov 2015 14:04:46 +1000, Clifford Heath <no....@please.net>
> wrote:
>> On 19/11/15 14:45, Bill Bowden wrote:
>>> Are these batteries good? Seems cheap for an 8 amp-hour Li-Ion battery
>> They lie. The very best 26650 Li-Ion are the Panasonic NCR cells,
>> which are about 5000mAH. The Ultrafire cells would be typically 1/3 of
>> that, or 1600mAH. Likewise all the other *fire Chinese brands
>> (TrustFire, SureFire, CatchOnFire, etc).
>> Furthermore, there's a whole industry repackaging dead cells scavenged
>> from old equipment.
>> Clifford Heath.
> No I think you exaggerate. I have never seen a *fire cell deliver 1/3 of
> the printed capacity - I think it is normally even less!
3400, so I think 1/3 is possible - though I know others have measured
less than 800mAH.
> Seriously to the OP, avoid *fire brands like the plague, apart from the
> dodge capacity labels most of them don't last long either.
right for the capacity.
Clifford Heath.
Jan Panteltje
Nov 20, 2015, 2:48:24 AM11/20/15
to
On a sunny day (Fri, 20 Nov 2015 10:27:43 +1000) it happened "David Eather"
<eat...@tpg.com.au> wrote in <op.x8dh8hgnwei6gd@phenom-pc>:
>> My spell-sker insists aussies is spelled as pussies
>
>Better get that checked - racial vilification is not pretty
>
Screenshot:
aussies File: ispell.tmp
hello aussies
0: pussies
----
It suggest pussies.
Its a good spell-sjeker ;-)
I'v been reading that site news.au. something a while back,
and really I've been down under, and it is a nice place (mainly outside the city),
but what I get from your news site is that they are severely insane and I have scrapped it of the list of places to go to.
The scientific explanation is that walking upside down may cause it.
Racial? You mean what you did to the Aboriginal?
Was not down under a punishment colony for UK criminals at one time,
they broke free and now rule there?
Got old, old women talk prevails, their politics are US slaved, insane rules.
What you do to fugitives... What you do to people who lived their and contributed to your economy for years
and the deport them for ?nothing? Some leader even stranger than the other?
NOT a good place to go.
<eat...@tpg.com.au> wrote in <op.x8dh8hgnwei6gd@phenom-pc>:
>> My spell-sker insists aussies is spelled as pussies
>
>Better get that checked - racial vilification is not pretty
>
aussies File: ispell.tmp
hello aussies
0: pussies
----
It suggest pussies.
Its a good spell-sjeker ;-)
I'v been reading that site news.au. something a while back,
and really I've been down under, and it is a nice place (mainly outside the city),
but what I get from your news site is that they are severely insane and I have scrapped it of the list of places to go to.
The scientific explanation is that walking upside down may cause it.
Racial? You mean what you did to the Aboriginal?
Was not down under a punishment colony for UK criminals at one time,
they broke free and now rule there?
Got old, old women talk prevails, their politics are US slaved, insane rules.
What you do to fugitives... What you do to people who lived their and contributed to your economy for years
and the deport them for ?nothing? Some leader even stranger than the other?
NOT a good place to go.
Jeff Liebermann
Nov 20, 2015, 11:58:41 AM11/20/15
to
On Thu, 19 Nov 2015 18:35:09 +1000, "David Eather" <eat...@tpg.com.au>
wrote:
>No I think you exaggerate. I have never seen a *fire cell deliver 1/3 of
>the printed capacity - I think it is normally even less!
1/3 is typical, but it's not all lying on the specs. The battery
capacity (ma-hr) decreases with increased current draw. The batteries
are usually specified at small currents that are hardly anywhere near
where the battery will eventually be used. Typically, I find
discharge curves that look like this:
<http://www.richtek.com/battery-management/img/battery-discharge.png>
For a 2000 ma-hr rated battery, batteries are tested at 0.2C (400 ma)
down to 2.75v and used at maybe 2C (2 amps) in a flashlight. The
higher operating current is going to cause some drop in capacity.
I tend to buy better cells these days, but unfortunately have run into
some counterfeits:
<https://www.google.com/#q=counterfeit+18650+batteries>
Notice that even the awful "fire" type batteries are being faked.
>Seriously to the OP, avoid *fire brands like the plague, apart from the
>dodge capacity labels most of them don't last long either. They will
>probably be the most expensive batteries you evet buy in terms of total
>power delivered and it will let you down when you need it most.
Yep. I had to learn that lesson the hard way. All of the "fire"
brand cells were well below rated capacity. For example, I tested an
UltraFire 3000 ma-hr cell at 1C (3A) and got 850 ma-hr:
<http://802.11junk.com/jeffl/LiPo/Ultrafire%20LiPo%203000%20ma-hr%2018650%20test.jpg>
I didn't have time to test it at 0.2C but my guess(tm) is that it
would produce about an 1000 ma-hr capacity. I've seen similar results
with other "fire" brand cells.
Note the improvised battery holder. For high currents, it's
necessary:
<http://802.11junk.com/jeffl/LiPo/Ultrafire%2018650%20test.jpg>
Everyone lies, but that's ok because nobody understands the numbers.
--
Jeff Liebermann je...@cruzio.com
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558
wrote:
>No I think you exaggerate. I have never seen a *fire cell deliver 1/3 of
>the printed capacity - I think it is normally even less!
capacity (ma-hr) decreases with increased current draw. The batteries
are usually specified at small currents that are hardly anywhere near
where the battery will eventually be used. Typically, I find
discharge curves that look like this:
<http://www.richtek.com/battery-management/img/battery-discharge.png>
For a 2000 ma-hr rated battery, batteries are tested at 0.2C (400 ma)
down to 2.75v and used at maybe 2C (2 amps) in a flashlight. The
higher operating current is going to cause some drop in capacity.
I tend to buy better cells these days, but unfortunately have run into
some counterfeits:
<https://www.google.com/#q=counterfeit+18650+batteries>
Notice that even the awful "fire" type batteries are being faked.
>Seriously to the OP, avoid *fire brands like the plague, apart from the
>dodge capacity labels most of them don't last long either. They will
>probably be the most expensive batteries you evet buy in terms of total
>power delivered and it will let you down when you need it most.
brand cells were well below rated capacity. For example, I tested an
UltraFire 3000 ma-hr cell at 1C (3A) and got 850 ma-hr:
<http://802.11junk.com/jeffl/LiPo/Ultrafire%20LiPo%203000%20ma-hr%2018650%20test.jpg>
I didn't have time to test it at 0.2C but my guess(tm) is that it
would produce about an 1000 ma-hr capacity. I've seen similar results
with other "fire" brand cells.
Note the improvised battery holder. For high currents, it's
necessary:
<http://802.11junk.com/jeffl/LiPo/Ultrafire%2018650%20test.jpg>
Everyone lies, but that's ok because nobody understands the numbers.
--
Jeff Liebermann je...@cruzio.com
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558
Spehro Pefhany
Nov 20, 2015, 12:04:17 PM11/20/15
to
marked capacity- I dissected one- it was not a used cell, just poorly
made and significantly lighter than a good one from a reputable
manufacturer.
It's kind of interesting when you open them up- the energy is still in
there, of course, and bits will spark and smoke when you breach the
film separator barrier.
--sp
Jeff Liebermann
Nov 20, 2015, 12:04:25 PM11/20/15
to
On Thu, 19 Nov 2015 09:12:43 GMT, Jan Panteltje
<pNaOnSt...@yahoo.com> wrote:
>Here is mine, now in use for almost 2 years:
> http://panteltje.com/pub/ultra_fire_batteries_and_flashlight_IMG_5158.JPG
Yes, but was it a real or counterfeit UltraFire battery?
<pNaOnSt...@yahoo.com> wrote:
>Here is mine, now in use for almost 2 years:
> http://panteltje.com/pub/ultra_fire_batteries_and_flashlight_IMG_5158.JPG
<http://www.ultrafire.net/shownews.asp?id=60>
<https://www.google.com/#q=counterfeit+ultrafire>
According to the "real" UltraFire web pile, they didn't make cells
over 3000 ma-hr, making your 3200 ma-hr cell a genuine counterfeit.
legg
Nov 20, 2015, 12:53:59 PM11/20/15
to
On Fri, 20 Nov 2015 12:10:54 -0500, Spehro Pefhany
<spef...@interlogDOTyou.knowwhat> wrote:
>On Thu, 19 Nov 2015 19:32:33 -0500, legg <le...@nospam.magma.ca> wrote:
>
>>On Wed, 18 Nov 2015 19:45:06 -0800, "Bill Bowden"
>><bpe...@bowdenshobbycircuits.info> wrote:
>>
>>>Are these batteries good? Seems cheap for an 8 amp-hour Li-Ion battery. You
>>>get two for $7.77 plus $2 shipping, or maybe $5 apiece..
>>>
>>>
>>>http://www.ebay.com/itm/2Pcs-26650-8000mAh-3-7v-Li-ion-Rechargeable-Battery-Cell-For-Electric-Tools-/111819891266?hash=item1a08fc2242:g:AfoAAOSw14xWKZ1t
>>>
>>>
>>Some batteries of this brand name are reviewed and dissassembled on
>>thi website:
>>
>>http://www.lygte-info.dk/info/indexBatteriesAndChargers UK.html
>>
>>They don't come off well.
>>Some samples had evidence of pre-use in other application formats.
>>
>>RL
>
>I mistakedly bought a couple 18650 Ultraf*re batteries- far less than
>marked capacity- I dissected one- it was not a used cell, just poorly
>made and significantly lighter than a good one from a reputable
>manufacturer.
>
>It's kind of interesting when you open them up- the energy is still in
>there, of course, and bits will spark and smoke when you breach the
>film separator barrier.
>
>
>
>--sp
It looks like there was once a valid UltraFire source that was either
<spef...@interlogDOTyou.knowwhat> wrote:
>On Thu, 19 Nov 2015 19:32:33 -0500, legg <le...@nospam.magma.ca> wrote:
>
>>On Wed, 18 Nov 2015 19:45:06 -0800, "Bill Bowden"
>><bpe...@bowdenshobbycircuits.info> wrote:
>>
>>>Are these batteries good? Seems cheap for an 8 amp-hour Li-Ion battery. You
>>>get two for $7.77 plus $2 shipping, or maybe $5 apiece..
>>>
>>>
>>>http://www.ebay.com/itm/2Pcs-26650-8000mAh-3-7v-Li-ion-Rechargeable-Battery-Cell-For-Electric-Tools-/111819891266?hash=item1a08fc2242:g:AfoAAOSw14xWKZ1t
>>>
>>>
>>Some batteries of this brand name are reviewed and dissassembled on
>>thi website:
>>
>>http://www.lygte-info.dk/info/indexBatteriesAndChargers UK.html
>>
>>They don't come off well.
>>Some samples had evidence of pre-use in other application formats.
>>
>>RL
>
>I mistakedly bought a couple 18650 Ultraf*re batteries- far less than
>marked capacity- I dissected one- it was not a used cell, just poorly
>made and significantly lighter than a good one from a reputable
>manufacturer.
>
>It's kind of interesting when you open them up- the energy is still in
>there, of course, and bits will spark and smoke when you breach the
>film separator barrier.
>
>
>
>--sp
compromised or cloned up the wazoo. Prices don't look unreasonably low
for some offerings, by chemistry and size but the mAH ratings are off
the wall - might read as WHr - would make more sense.
When the polymer protective layer breaks on an internally protected
cell contact (permanently), there's often energy stored in the dead
cell. The protection method wass unpopular, as the polymer seemed
unpredictable with age and environment, producing premature
opencircuits.
On disassembly, this remenant can result in spontaneous combustion.
I disassembled these things under water, when I had to. Once a useful
source of plated stamped copper mesh. I'm not so sure all that free
lithium is good for you, unless prescribed by local MH Professionals.
RL
David Eather
Nov 20, 2015, 7:18:15 PM11/20/15
to
On Fri, 20 Nov 2015 10:27:43 +1000, David Eather <eat...@tpg.com.au> wrote:
> On Thu, 19 Nov 2015 19:12:43 +1000, Jan Panteltje
> <pNaOnSt...@yahoo.com> wrote:
>
>> On a sunny day (Thu, 19 Nov 2015 18:35:09 +1000) it happened "David
>> Eather"
>> <eat...@tpg.com.au> wrote in <op.x8b94vrlwei6gd@phenom-pc>:
>>
>>> No I think you exaggerate. I have never seen a *fire cell deliver 1/3
>>> of
>>> the printed capacity - I think it is normally even less!
>>> Seriously to the OP, avoid *fire brands like the plague, apart from the
>>> dodge capacity labels most of them don't last long either. They will
>>> probably be the most expensive batteries you evet buy in terms of total
>>> power delivered and it will let you down when you need it most.
>>
>> Well, do you actually have one?
>
> I was stupid enough to buy 3 sets of *fire over the years. One set of 4
> NiMh AA's (I know we are talking about LiPo here but this is just for
> illustration) had no usable cells. 2 of the batteries charge once or
> twice to a few mA/Hrs the others were dead shorts or immediately
> rejected by my charger. The other sets (of various types)were better,
> but not by much.
>
Oh, my bad. The really crap set of batteries described above came from BTY
> On Thu, 19 Nov 2015 19:12:43 +1000, Jan Panteltje
> <pNaOnSt...@yahoo.com> wrote:
>
>> On a sunny day (Thu, 19 Nov 2015 18:35:09 +1000) it happened "David
>> Eather"
>> <eat...@tpg.com.au> wrote in <op.x8b94vrlwei6gd@phenom-pc>:
>>
>>> No I think you exaggerate. I have never seen a *fire cell deliver 1/3
>>> of
>>> the printed capacity - I think it is normally even less!
>>> Seriously to the OP, avoid *fire brands like the plague, apart from the
>>> dodge capacity labels most of them don't last long either. They will
>>> probably be the most expensive batteries you evet buy in terms of total
>>> power delivered and it will let you down when you need it most.
>>
>> Well, do you actually have one?
>
> I was stupid enough to buy 3 sets of *fire over the years. One set of 4
> NiMh AA's (I know we are talking about LiPo here but this is just for
> illustration) had no usable cells. 2 of the batteries charge once or
> twice to a few mA/Hrs the others were dead shorts or immediately
> rejected by my charger. The other sets (of various types)were better,
> but not by much.
>
(batteries though you? ha ha)
dagmarg...@yahoo.com
Nov 20, 2015, 7:18:36 PM11/20/15
to
On Friday, November 20, 2015 at 12:04:25 PM UTC-5, Jeff Liebermann wrote:
> On Thu, 19 Nov 2015 09:12:43 GMT, Jan Panteltje
> <pNaOnSt...@yahoo.com> wrote:
>
> >Here is mine, now in use for almost 2 years:
> > http://panteltje.com/pub/ultra_fire_batteries_and_flashlight_IMG_5158.JPG
>
> Yes, but was it a real or counterfeit UltraFire battery?
> <http://www.ultrafire.net/shownews.asp?id=60>
> <https://www.google.com/#q=counterfeit+ultrafire>
> According to the "real" UltraFire web pile, they didn't make cells
> over 3000 ma-hr, making your 3200 ma-hr cell a genuine counterfeit.
Genuine counterfeits--insist on nothing less!
> On Thu, 19 Nov 2015 09:12:43 GMT, Jan Panteltje
> <pNaOnSt...@yahoo.com> wrote:
>
> >Here is mine, now in use for almost 2 years:
> > http://panteltje.com/pub/ultra_fire_batteries_and_flashlight_IMG_5158.JPG
>
> Yes, but was it a real or counterfeit UltraFire battery?
> <http://www.ultrafire.net/shownews.asp?id=60>
> <https://www.google.com/#q=counterfeit+ultrafire>
> According to the "real" UltraFire web pile, they didn't make cells
> over 3000 ma-hr, making your 3200 ma-hr cell a genuine counterfeit.
And why settle for 8Ah? All mine are 80Ah. :-)
Cheers,
James Arthur
David Eather
Nov 20, 2015, 7:23:55 PM11/20/15
to
On Fri, 20 Nov 2015 17:48:18 +1000, Jan Panteltje
<pNaOnSt...@yahoo.com> wrote:
> On a sunny day (Fri, 20 Nov 2015 10:27:43 +1000) it happened "David
> Eather"
> <eat...@tpg.com.au> wrote in <op.x8dh8hgnwei6gd@phenom-pc>:
>
>>> My spell-sker insists aussies is spelled as pussies
>>
>> Better get that checked - racial vilification is not pretty
>>
>
> Screenshot:
> aussies File: ispell.tmp
>
>
>
>
>
>
>
> hello aussies
>
> 0: pussies
>
> ----
> It suggest pussies.
> Its a good spell-sjeker ;-)
>
>
> I'v been reading that site news.au. something a while back,
> and really I've been down under, and it is a nice place (mainly outside
> the city),
> but what I get from your news site is that they are severely insane and
> I have scrapped it of the list of places to go to.
Yes or latest political pushes have made our news service and the public
<pNaOnSt...@yahoo.com> wrote:
> On a sunny day (Fri, 20 Nov 2015 10:27:43 +1000) it happened "David
> Eather"
> <eat...@tpg.com.au> wrote in <op.x8dh8hgnwei6gd@phenom-pc>:
>
>>> My spell-sker insists aussies is spelled as pussies
>>
>> Better get that checked - racial vilification is not pretty
>>
>
> Screenshot:
> aussies File: ispell.tmp
>
>
>
>
>
>
>
> hello aussies
>
> 0: pussies
>
> ----
> It suggest pussies.
> Its a good spell-sjeker ;-)
>
>
> I'v been reading that site news.au. something a while back,
> and really I've been down under, and it is a nice place (mainly outside
> the city),
> but what I get from your news site is that they are severely insane and
> I have scrapped it of the list of places to go to.
interest crap
>
> The scientific explanation is that walking upside down may cause it.
>
> Racial? You mean what you did to the Aboriginal?
But yes. It remains a screw up of the highest order. Unfortunately it
seems to have few if any solutions
>
>
> Was not down under a punishment colony for UK criminals at one time,
> they broke free and now rule there?
criminal records
> Got old, old women talk prevails, their politics are US slaved, insane
> rules.
> What you do to fugitives... What you do to people who lived their and
> contributed to your economy for years
> and the deport them for ?nothing? Some leader even stranger than the
> other?
>
> NOT a good place to go.
>
>
>
is the whole truth
Jeff Liebermann
Nov 20, 2015, 10:17:40 PM11/20/15
to
On Fri, 20 Nov 2015 16:18:32 -0800 (PST), dagmarg...@yahoo.com
wrote:
All your batteries are belong to us.
<https://en.wikipedia.org/wiki/All_your_base_are_belong_to_us>
You have no chance to survive, make your time.
wrote:
<https://en.wikipedia.org/wiki/All_your_base_are_belong_to_us>
You have no chance to survive, make your time.
Jan Panteltje
Nov 21, 2015, 3:15:34 AM11/21/15
to
On a sunny day (Fri, 20 Nov 2015 09:04:58 -0800) it happened Jeff Liebermann
<je...@cruzio.com> wrote in <ogku4b1edgtqvjfmq...@4ax.com>:
>On Thu, 19 Nov 2015 09:12:43 GMT, Jan Panteltje
><pNaOnSt...@yahoo.com> wrote:
>
>>Here is mine, now in use for almost 2 years:
>> http://panteltje.com/pub/ultra_fire_batteries_and_flashlight_IMG_5158.JPG
>
>Yes, but was it a real or counterfeit UltraFire battery?
><http://www.ultrafire.net/shownews.asp?id=60>
><https://www.google.com/#q=counterfeit+ultrafire>
Wow, did not know about that site.
Sure, from the spelling on the battery it is clear you are not dealing with a real multinational:
http://panteltje.com/pub/utra_fire_protected_against_almost_everything_IMG_5162.JPG
>According to the "real" UltraFire web pile, they didn't make cells
>over 3000 ma-hr, making your 3200 ma-hr cell a genuine counterfeit.
But, it gets the work done, if it was made of chewing gum and kept my flashlight working I would be happy too,
even if it had only a picture of Mickey Mouse on it.
I get many things from China that look like 'home made',
for example the 1 Ah lipos with Varta on it, I am still not sure it really _is_ Varta,
but... 300 charge / discharge (90 %) cycles later I see a slight decrease in capacity.
reasonable for a lipo...
Its just a consumable...
Because I did see that decrease, and these need to run 12 hours a day,
(now talking lipo) I bought some of these power packs to test:
http://panteltje.com/pub/high_power_lipos_IMG_5145.JPG
I still have to solder these in...
It is actually these:
http://www.ebay.com/itm/151808064280
These ones have _no_ protection unlike the Varta marked ones, so BIG currents may flow.
So... 25 A discharge? Will see, will likely add a fuse.
<je...@cruzio.com> wrote in <ogku4b1edgtqvjfmq...@4ax.com>:
>On Thu, 19 Nov 2015 09:12:43 GMT, Jan Panteltje
><pNaOnSt...@yahoo.com> wrote:
>
>>Here is mine, now in use for almost 2 years:
>> http://panteltje.com/pub/ultra_fire_batteries_and_flashlight_IMG_5158.JPG
>
>Yes, but was it a real or counterfeit UltraFire battery?
><http://www.ultrafire.net/shownews.asp?id=60>
><https://www.google.com/#q=counterfeit+ultrafire>
Sure, from the spelling on the battery it is clear you are not dealing with a real multinational:
http://panteltje.com/pub/utra_fire_protected_against_almost_everything_IMG_5162.JPG
>According to the "real" UltraFire web pile, they didn't make cells
>over 3000 ma-hr, making your 3200 ma-hr cell a genuine counterfeit.
even if it had only a picture of Mickey Mouse on it.
I get many things from China that look like 'home made',
for example the 1 Ah lipos with Varta on it, I am still not sure it really _is_ Varta,
but... 300 charge / discharge (90 %) cycles later I see a slight decrease in capacity.
reasonable for a lipo...
Its just a consumable...
Because I did see that decrease, and these need to run 12 hours a day,
(now talking lipo) I bought some of these power packs to test:
http://panteltje.com/pub/high_power_lipos_IMG_5145.JPG
I still have to solder these in...
It is actually these:
http://www.ebay.com/itm/151808064280
These ones have _no_ protection unlike the Varta marked ones, so BIG currents may flow.
So... 25 A discharge? Will see, will likely add a fuse.
upsid...@downunder.com
Nov 21, 2015, 3:44:33 AM11/21/15
to
On Thu, 19 Nov 2015 15:04:46 +1100, Clifford Heath
<no....@please.net> wrote:
>On 19/11/15 14:45, Bill Bowden wrote:
>> Are these batteries good? Seems cheap for an 8 amp-hour Li-Ion battery
>
>They lie. The very best 26650 Li-Ion are the Panasonic NCR cells, which
>are about 5000mAH. The Ultrafire cells would be typically 1/3 of that,
>or 1600mAH. Likewise all the other *fire Chinese brands (TrustFire,
>SureFire, CatchOnFire, etc).
I thought that these *Fire names are just nicknames for cells that
<no....@please.net> wrote:
>On 19/11/15 14:45, Bill Bowden wrote:
>> Are these batteries good? Seems cheap for an 8 amp-hour Li-Ion battery
>
>They lie. The very best 26650 Li-Ion are the Panasonic NCR cells, which
>are about 5000mAH. The Ultrafire cells would be typically 1/3 of that,
>or 1600mAH. Likewise all the other *fire Chinese brands (TrustFire,
>SureFire, CatchOnFire, etc).
catch fire (when abused).
However, some manufacturers seems to be actually using such real brand
names, perhaps honest, but not so good marketing strategy :-)
Jeff Liebermann
Nov 21, 2015, 12:53:54 PM11/21/15
to
On Sat, 21 Nov 2015 08:15:30 GMT, Jan Panteltje
<pNaOnSt...@yahoo.com> wrote:
>>According to the "real" UltraFire web pile, they didn't make cells
>>over 3000 ma-hr, making your 3200 ma-hr cell a genuine counterfeit.
>
>But, it gets the work done, if it was made of chewing gum and kept my flashlight working I would be happy too,
>even if it had only a picture of Mickey Mouse on it.
What you are probably buying are 1000 ma-hr 18650 cells marked with
<pNaOnSt...@yahoo.com> wrote:
>>According to the "real" UltraFire web pile, they didn't make cells
>>over 3000 ma-hr, making your 3200 ma-hr cell a genuine counterfeit.
>
>But, it gets the work done, if it was made of chewing gum and kept my flashlight working I would be happy too,
>even if it had only a picture of Mickey Mouse on it.
whatever the vendor thinks will sell. The cell is good enough for
most things, but not if you're trying to squeeze every last coulomb
out of the cell, as in quadcopters or flashlights. They're probably
just fine for your instrument experiments, eBikes, and vapo-smog
generators. I'm not sure about the number of charge cycles on these
batteries. It's my understand (possibly wrong) that cell design can
optimize capacity or charge cycles, but not both.
>I get many things from China that look like 'home made',
>for example the 1 Ah lipos with Varta on it, I am still not sure it really _is_ Varta,
>but... 300 charge / discharge (90 %) cycles later I see a slight decrease in capacity.
>reasonable for a lipo...
terminal voltage do you stop brutalizing those batteries? See Fig 2:
<http://www.mdpi.com/1996-1073/7/9/5995/htm>
10% would be about 3.50V.
For extra fun, run a frequency scan of your LiIon battery and watch it
age:
<http://batteryuniversity.com/learn/article/testing_lithium_based_batteries>
I haven't done this but plan to throw together something to do it,
some day, later, maybe...
>Its just a consumable...
Money is also a consumable. Whatever works for you, as long as it
doesn't become a collectable, which is responsible for my mess.
>Because I did see that decrease, and these need to run 12 hours a day,
>(now talking lipo) I bought some of these power packs to test:
> http://panteltje.com/pub/high_power_lipos_IMG_5145.JPG
>I still have to solder these in...
>It is actually these:
> http://www.ebay.com/itm/151808064280
<http://www.hobbyking.com/hobbyking/store/__86__85__Batteries_Accessories-Li_Poly_All_brands_.html>
This is my favorite 11.1v battery pack:
<https://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=26472>
Yes, I pay extra for the shrink wrap, power connector, balance
charging connector, but don't want to build battery packs (until I get
spot welder).
>These ones have _no_ protection unlike the Varta marked ones, so BIG currents may flow.
>So... 25 A discharge? Will see, will likely add a fuse.
discharge:
25 * 2.2A = 55A
with a maximum charge rate of 5C or:
5 * 2.2A = 11A
You might as well use a PCB trace as a fuse. However, you can get
chargers with overcurrent protection:
<http://www.ebay.com/itm/281843079093> 3S, 4-5A
<http://www.ebay.com/itm/181749089393> 3S, 10-15A
Spehro Pefhany
Nov 21, 2015, 1:37:58 PM11/21/15
to
On Sat, 21 Nov 2015 10:44:27 +0200, the renowned
upsid...@downunder.com wrote:
>On Thu, 19 Nov 2015 15:04:46 +1100, Clifford Heath
><no....@please.net> wrote:
>
>>On 19/11/15 14:45, Bill Bowden wrote:
>>> Are these batteries good? Seems cheap for an 8 amp-hour Li-Ion battery
>>
>>They lie. The very best 26650 Li-Ion are the Panasonic NCR cells, which
>>are about 5000mAH. The Ultrafire cells would be typically 1/3 of that,
>>or 1600mAH. Likewise all the other *fire Chinese brands (TrustFire,
>>SureFire, CatchOnFire, etc).
>
>I thought that these *Fire names are just nicknames for cells that
>catch fire (when abused).
Hopefully *only* when abused.
upsid...@downunder.com wrote:
>On Thu, 19 Nov 2015 15:04:46 +1100, Clifford Heath
><no....@please.net> wrote:
>
>>On 19/11/15 14:45, Bill Bowden wrote:
>>> Are these batteries good? Seems cheap for an 8 amp-hour Li-Ion battery
>>
>>They lie. The very best 26650 Li-Ion are the Panasonic NCR cells, which
>>are about 5000mAH. The Ultrafire cells would be typically 1/3 of that,
>>or 1600mAH. Likewise all the other *fire Chinese brands (TrustFire,
>>SureFire, CatchOnFire, etc).
>
>I thought that these *Fire names are just nicknames for cells that
>catch fire (when abused).
>However, some manufacturers seems to be actually using such real brand
>names, perhaps honest, but not so good marketing strategy :-)
associations in the mind (of a native speaker). I was helping folks
come up with an English name for a new company last month- the names
that I thought were good were (of course) already taken and most of
the ones they came up with had unpleasant, unfortunate or sexual
connotations that were difficult to explain. Complicated by regulatory
limitations in some markets on what you can call your company, as well
as just simply not being so close as to poach on another's name. There
are companies that do nothing but this: http://www.namelab.com/ , but
doing a thorough job is not cheap. There are surely regional
variations as well as variations from country to country, even those
that nominally use the same language, especially where slang and
association with regional events and entities are involved.
Jeff Liebermann
Nov 21, 2015, 2:14:36 PM11/21/15
to
On Sat, 21 Nov 2015 13:37:46 -0500, Spehro Pefhany
<spef...@interlogDOTyou.knowwhat> wrote:
>It's very difficult to come up with names that don't create unwanted
>associations in the mind (of a native speaker).
Then, there are companies that are cheap, lazy, or both.
<spef...@interlogDOTyou.knowwhat> wrote:
>It's very difficult to come up with names that don't create unwanted
>associations in the mind (of a native speaker).
A123 battery company was forced to change its name as part of the
buyout deal and became B456:
<http://www.forbes.com/sites/kaipetainen/2013/03/28/battery-company-changes-name-from-a123-to-b456-a-fire-extinguisher/>
Apparently, they didn't want to waste any money finding a new name for
essentially a place holder. Too bad a B456 is actually a fire
extinguisher.
<http://www.amerexfireextinguishers.com/html/abc_.html>
Seeing a pattern here, I Googled for C789 and found a Fluke meter:
<http://en-us.fluke.com/products/all-accessories/fluke-c789.html>
Meanwhile, one of the founders of the original A123 company formed a
new battery company, 24M to make cheaper LiIon cells:
<http://24-m.com>
Jan Panteltje
Nov 21, 2015, 2:45:56 PM11/21/15
to
On a sunny day (Sat, 21 Nov 2015 09:53:48 -0800) it happened Jeff Liebermann
<je...@cruzio.com> wrote in <b4a15bdprkj42q39r...@4ax.com>:
>On Sat, 21 Nov 2015 08:15:30 GMT, Jan Panteltje
><pNaOnSt...@yahoo.com> wrote:
>
>>>According to the "real" UltraFire web pile, they didn't make cells
>>>over 3000 ma-hr, making your 3200 ma-hr cell a genuine counterfeit.
>>
>>But, it gets the work done, if it was made of chewing gum and kept my flashlight working I would be happy too,
>>even if it had only a picture of Mickey Mouse on it.
>
>What you are probably buying are 1000 ma-hr 18650 cells marked with
>whatever the vendor thinks will sell. The cell is good enough for
>most things, but not if you're trying to squeeze every last coulomb
>out of the cell, as in quadcopters or flashlights. They're probably
>just fine for your instrument experiments, eBikes, and vapo-smog
>generators. I'm not sure about the number of charge cycles on these
>batteries. It's my understand (possibly wrong) that cell design can
>optimize capacity or charge cycles, but not both.
>
>>I get many things from China that look like 'home made',
>>for example the 1 Ah lipos with Varta on it, I am still not sure it really _is_ Varta,
>>but... 300 charge / discharge (90 %) cycles later I see a slight decrease in capacity.
>>reasonable for a lipo...
>
>At 90% discharge, you should be killing those batteries. At what
>terminal voltage do you stop brutalizing those batteries? See Fig 2:
><http://www.mdpi.com/1996-1073/7/9/5995/htm>
>10% would be about 3.50V.
Eh, let's see, from asm source:
; Lipo battery cutoff voltage in mV
#define BATTERY_LOW_CUTOFF_VOLTAGE D'3100'
; Display will warn at this battery voltage level that battery needs charging
#define BATTERY_LOW_WARNING_VOLTAGE D'3200'
This is what I measured on the 'Varta' marked lipos:
http://panteltje.com/pub/lipo_discharge_curve_low_drop_out_regulator.gif
You will note that from warning at 3.2 V to switch-off at 3.1 V only takes a minute or less...
It crapped out once this week (am not always around to see warnings).
Don't remember the discharge current.
Now that you mention this I will try in a test-setup at a modest current (maybe 1 A) how long these new ones last.
I like your big heatsink with fan battery test setup.
>For extra fun, run a frequency scan of your LiIon battery and watch it
>age:
><http://batteryuniversity.com/learn/article/testing_lithium_based_batteries>
>I haven't done this but plan to throw together something to do it,
>some day, later, maybe...
The difference at the peak is only about 20/28 or 71%...
>>Its just a consumable...
>
>Money is also a consumable. Whatever works for you, as long as it
>doesn't become a collectable, which is responsible for my mess.
>
>>Because I did see that decrease, and these need to run 12 hours a day,
>>(now talking lipo) I bought some of these power packs to test:
>> http://panteltje.com/pub/high_power_lipos_IMG_5145.JPG
>>I still have to solder these in...
>>It is actually these:
>> http://www.ebay.com/itm/151808064280
>
>I use similar batteries, mostly those used by the RC community.
><http://www.hobbyking.com/hobbyking/store/__86__85__Batteries_Accessories-Li_Poly_All_brands_.html>
>This is my favorite 11.1v battery pack:
><https://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=26472>
>Yes, I pay extra for the shrink wrap, power connector, balance
>charging connector, but don't want to build battery packs (until I get
>spot welder).
Yes I have something like that from the local RC shop for my laser RC plane:
http://panteltje.com/pub/lipo_jump_starter_IMG_5105.JPG
used it to jump start my scooter :-)
>>These ones have _no_ protection unlike the Varta marked ones, so BIG currents may flow.
>>So... 25 A discharge? Will see, will likely add a fuse.
>
>The aformentioned favorite 11.1v battery is rated at 25C continuous
>discharge:
> 25 * 2.2A = 55A
>with a maximum charge rate of 5C or:
> 5 * 2.2A = 11A
>You might as well use a PCB trace as a fuse. However, you can get
>chargers with overcurrent protection:
><http://www.ebay.com/itm/281843079093> 3S, 4-5A
><http://www.ebay.com/itm/181749089393> 3S, 10-15A
Yes, well I meant the fuse for accidently shorting it.
<je...@cruzio.com> wrote in <b4a15bdprkj42q39r...@4ax.com>:
>On Sat, 21 Nov 2015 08:15:30 GMT, Jan Panteltje
><pNaOnSt...@yahoo.com> wrote:
>
>>>According to the "real" UltraFire web pile, they didn't make cells
>>>over 3000 ma-hr, making your 3200 ma-hr cell a genuine counterfeit.
>>
>>But, it gets the work done, if it was made of chewing gum and kept my flashlight working I would be happy too,
>>even if it had only a picture of Mickey Mouse on it.
>
>What you are probably buying are 1000 ma-hr 18650 cells marked with
>whatever the vendor thinks will sell. The cell is good enough for
>most things, but not if you're trying to squeeze every last coulomb
>out of the cell, as in quadcopters or flashlights. They're probably
>just fine for your instrument experiments, eBikes, and vapo-smog
>generators. I'm not sure about the number of charge cycles on these
>batteries. It's my understand (possibly wrong) that cell design can
>optimize capacity or charge cycles, but not both.
>
>>I get many things from China that look like 'home made',
>>for example the 1 Ah lipos with Varta on it, I am still not sure it really _is_ Varta,
>>but... 300 charge / discharge (90 %) cycles later I see a slight decrease in capacity.
>>reasonable for a lipo...
>
>At 90% discharge, you should be killing those batteries. At what
>terminal voltage do you stop brutalizing those batteries? See Fig 2:
><http://www.mdpi.com/1996-1073/7/9/5995/htm>
>10% would be about 3.50V.
; Lipo battery cutoff voltage in mV
#define BATTERY_LOW_CUTOFF_VOLTAGE D'3100'
; Display will warn at this battery voltage level that battery needs charging
#define BATTERY_LOW_WARNING_VOLTAGE D'3200'
This is what I measured on the 'Varta' marked lipos:
http://panteltje.com/pub/lipo_discharge_curve_low_drop_out_regulator.gif
You will note that from warning at 3.2 V to switch-off at 3.1 V only takes a minute or less...
It crapped out once this week (am not always around to see warnings).
Don't remember the discharge current.
Now that you mention this I will try in a test-setup at a modest current (maybe 1 A) how long these new ones last.
I like your big heatsink with fan battery test setup.
>For extra fun, run a frequency scan of your LiIon battery and watch it
>age:
><http://batteryuniversity.com/learn/article/testing_lithium_based_batteries>
>I haven't done this but plan to throw together something to do it,
>some day, later, maybe...
>>Its just a consumable...
>
>Money is also a consumable. Whatever works for you, as long as it
>doesn't become a collectable, which is responsible for my mess.
>
>>Because I did see that decrease, and these need to run 12 hours a day,
>>(now talking lipo) I bought some of these power packs to test:
>> http://panteltje.com/pub/high_power_lipos_IMG_5145.JPG
>>I still have to solder these in...
>>It is actually these:
>> http://www.ebay.com/itm/151808064280
>
>I use similar batteries, mostly those used by the RC community.
><http://www.hobbyking.com/hobbyking/store/__86__85__Batteries_Accessories-Li_Poly_All_brands_.html>
>This is my favorite 11.1v battery pack:
><https://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=26472>
>Yes, I pay extra for the shrink wrap, power connector, balance
>charging connector, but don't want to build battery packs (until I get
>spot welder).
http://panteltje.com/pub/lipo_jump_starter_IMG_5105.JPG
used it to jump start my scooter :-)
>>These ones have _no_ protection unlike the Varta marked ones, so BIG currents may flow.
>>So... 25 A discharge? Will see, will likely add a fuse.
>
>The aformentioned favorite 11.1v battery is rated at 25C continuous
>discharge:
> 25 * 2.2A = 55A
>with a maximum charge rate of 5C or:
> 5 * 2.2A = 11A
>You might as well use a PCB trace as a fuse. However, you can get
>chargers with overcurrent protection:
><http://www.ebay.com/itm/281843079093> 3S, 4-5A
><http://www.ebay.com/itm/181749089393> 3S, 10-15A
Spehro Pefhany
Nov 21, 2015, 3:02:12 PM11/21/15
to
On Sat, 21 Nov 2015 08:15:30 GMT, the renowned Jan Panteltje
<pNaOnSt...@yahoo.com> wrote:
>I get many things from China that look like 'home made',
>for example the 1 Ah lipos with Varta on it, I am still not sure it really _is_ Varta,
>but... 300 charge / discharge (90 %) cycles later I see a slight decrease in capacity.
>reasonable for a lipo...
Possibly (probably) fake.
<pNaOnSt...@yahoo.com> wrote:
>I get many things from China that look like 'home made',
>for example the 1 Ah lipos with Varta on it, I am still not sure it really _is_ Varta,
>but... 300 charge / discharge (90 %) cycles later I see a slight decrease in capacity.
>reasonable for a lipo...
I replaced the Varta NiCd cells in a car instrument cluster a few
years ago- they lasted more than 20 years!
Jeff Liebermann
Nov 21, 2015, 5:25:37 PM11/21/15
to
On Sat, 21 Nov 2015 19:45:17 GMT, Jan Panteltje
<pNaOnSt...@yahoo.com> wrote:
>On a sunny day (Sat, 21 Nov 2015 09:53:48 -0800) it happened Jeff Liebermann
><je...@cruzio.com> wrote in <b4a15bdprkj42q39r...@4ax.com>:
<pNaOnSt...@yahoo.com> wrote:
>On a sunny day (Sat, 21 Nov 2015 09:53:48 -0800) it happened Jeff Liebermann
><je...@cruzio.com> wrote in <b4a15bdprkj42q39r...@4ax.com>:
>>At 90% discharge, you should be killing those batteries. At what
>>terminal voltage do you stop brutalizing those batteries? See Fig 2:
>><http://www.mdpi.com/1996-1073/7/9/5995/htm>
>>10% would be about 3.50V.
Here's another way of doing it. Charge the battery to some voltage
>>terminal voltage do you stop brutalizing those batteries? See Fig 2:
>><http://www.mdpi.com/1996-1073/7/9/5995/htm>
>>10% would be about 3.50V.
below 4.2v and see how much capacity it has left:
<http://www.powerstream.com/lithium-ion-charge-voltage.htm>
Presumably, when it's done charging, the terminal voltage will equal
the charging voltage. At your 3.1v cutoff, the % of rated charge is
zero. 10% looks to be about 3.75V.
For LiFePO4 cells, 10% is about 3.25V.
<http://www.powerstream.com/lithium-phosphate-charge-voltage.htm>
Incidentally, notice how many charges he gets if you charges to
something less the 100% of capacity.
>Eh, let's see, from asm source:
>; Lipo battery cutoff voltage in mV
>#define BATTERY_LOW_CUTOFF_VOLTAGE D'3100'
>
>; Display will warn at this battery voltage level that battery needs charging
>#define BATTERY_LOW_WARNING_VOLTAGE D'3200'
>
>This is what I measured on the 'Varta' marked lipos:
> http://panteltje.com/pub/lipo_discharge_curve_low_drop_out_regulator.gif
to drop off rapidly, it's time to stop charging.
>Now that you mention this I will try in a test-setup at a modest current (maybe 1 A) how long these new ones last.
<http://802.11junk.com/jeffl/LiPo/Ultrafire%2018650%20test.jpg>
I was getting really erratic results when I was using a battery holder
like this:
<http://802.11junk.com/jeffl/NiMH/cba-II.jpg>
Use the force.
>I like your big heatsink with fan battery test setup.
The heat sink and fan are necessary. I accidentally dumped some loose
junk over the fan, which then stopped. About 30 mins later, I smelled
smoke.
If you plan to build your own, please note that the CBA II has a
design defect in that it measures the battery voltage at the wrong end
of the test leads. At high currents, the voltage drop through the
leads and battery contacts can be substantial. I wanted to move the
sense wires from inside the device to the battery terminals, but never
finished.
For my test, I used 1.3A because that's what the flashlight I was
testing draws at maximum brightness. I would expect your counterfeit
cells to look very much like my counterfeit test battery:
<http://802.11junk.com/jeffl/LiPo/Ultrafire%20LiPo%203000%20ma-hr%2018650%20test.jpg>
>Yes, well I meant the fuse for accidently shorting it.
a partly discharged battery and a not so perfect short, such as a
screwdriver. A fully charged battery and a good short circuit will
blow most any fuse or fusible link. However, that's not always the
case when it shorts. I've had the fuse do nothing while the wiring
got hot enough to melt the insulation. Fusible links:
<http://www1.cooperbussmann.com/pdf/01e5795a-2857-422e-85c0-62eb8b13d2c5.pdf>
Jan Panteltje
Nov 22, 2015, 2:11:14 AM11/22/15
to
On a sunny day (Sat, 21 Nov 2015 14:25:34 -0800) it happened Jeff Liebermann
<je...@cruzio.com> wrote in <vrp15b5vmsig704sj...@4ax.com>:
>On Sat, 21 Nov 2015 19:45:17 GMT, Jan Panteltje
><pNaOnSt...@yahoo.com> wrote:
>
>>On a sunny day (Sat, 21 Nov 2015 09:53:48 -0800) it happened Jeff Liebermann
>><je...@cruzio.com> wrote in <b4a15bdprkj42q39r...@4ax.com>:
>>>At 90% discharge, you should be killing those batteries. At what
>>>terminal voltage do you stop brutalizing those batteries? See Fig 2:
>>><http://www.mdpi.com/1996-1073/7/9/5995/htm>
>>>10% would be about 3.50V.
>
>Here's another way of doing it. Charge the battery to some voltage
>below 4.2v and see how much capacity it has left:
><http://www.powerstream.com/lithium-ion-charge-voltage.htm>
>Presumably, when it's done charging, the terminal voltage will equal
>the charging voltage. At your 3.1v cutoff, the % of rated charge is
>zero. 10% looks to be about 3.75V.
>
>For LiFePO4 cells, 10% is about 3.25V.
><http://www.powerstream.com/lithium-phosphate-charge-voltage.htm>
>
>Incidentally, notice how many charges he gets if you charges to
>something less the 100% of capacity.
I have only one lifepo4 cell so far, like this, but different seller):
http://www.ebay.com/itm/220983787601
it is in a keyboard, I only charged it once.. IIRC in May 2014, it is still working..
I do see prices are now coming down for lifepo4.
>>Eh, let's see, from asm source:
>>; Lipo battery cutoff voltage in mV
>>#define BATTERY_LOW_CUTOFF_VOLTAGE D'3100'
>>
>>; Display will warn at this battery voltage level that battery needs charging
>>#define BATTERY_LOW_WARNING_VOLTAGE D'3200'
>>
>>This is what I measured on the 'Varta' marked lipos:
>> http://panteltje.com/pub/lipo_discharge_curve_low_drop_out_regulator.gif
>
>As I understand it, when the discharge curve hits the knee and starts
>to drop off rapidly, it's time to stop charging.
>
>>Now that you mention this I will try in a test-setup at a modest current (maybe 1 A) how long these new ones last.
>
>Don't forget the battery terminal clamp.
><http://802.11junk.com/jeffl/LiPo/Ultrafire%2018650%20test.jpg>
>I was getting really erratic results when I was using a battery holder
>like this:
><http://802.11junk.com/jeffl/NiMH/cba-II.jpg>
>Use the force.
Right, and do not use Chinese Alligator test leads, the copper wire in those is so thin that at 100 mA it drops up to 2 V
for a 50 cm lead!
This has gotten me several times, finally keeping the alligator clips and soldering real wires on it.
Were not even soldered, just sort of pressed against the metal.
>>I like your big heatsink with fan battery test setup.
>
><http://www.westmountainradio.com/cba.php>
>The heat sink and fan are necessary. I accidentally dumped some loose
>junk over the fan, which then stopped. About 30 mins later, I smelled
>smoke.
>
>If you plan to build your own, please note that the CBA II has a
>design defect in that it measures the battery voltage at the wrong end
>of the test leads. At high currents, the voltage drop through the
>leads and battery contacts can be substantial. I wanted to move the
>sense wires from inside the device to the battery terminals, but never
>finished.
Ehh I should have read ahead!
>For my test, I used 1.3A because that's what the flashlight I was
>testing draws at maximum brightness. I would expect your counterfeit
>cells to look very much like my counterfeit test battery:
><http://802.11junk.com/jeffl/LiPo/Ultrafire%20LiPo%203000%20ma-hr%2018650%20test.jpg>
>
>>Yes, well I meant the fuse for accidently shorting it.
>
>You might want to measure how long it will take your fuse to blow with
>a partly discharged battery and a not so perfect short, such as a
>screwdriver. A fully charged battery and a good short circuit will
>blow most any fuse or fusible link. However, that's not always the
>case when it shorts. I've had the fuse do nothing while the wiring
>got hot enough to melt the insulation. Fusible links:
><http://www1.cooperbussmann.com/pdf/01e5795a-2857-422e-85c0-62eb8b13d2c5.pdf>
Or make your own electronic over current switch,
depends on how much you trust your own designs...
:-)
But I think to fuse a 25 A capable lipo battery with a 1 A fast fuse is OK for what I do.
<je...@cruzio.com> wrote in <vrp15b5vmsig704sj...@4ax.com>:
>On Sat, 21 Nov 2015 19:45:17 GMT, Jan Panteltje
><pNaOnSt...@yahoo.com> wrote:
>
>>On a sunny day (Sat, 21 Nov 2015 09:53:48 -0800) it happened Jeff Liebermann
>><je...@cruzio.com> wrote in <b4a15bdprkj42q39r...@4ax.com>:
>>>At 90% discharge, you should be killing those batteries. At what
>>>terminal voltage do you stop brutalizing those batteries? See Fig 2:
>>><http://www.mdpi.com/1996-1073/7/9/5995/htm>
>>>10% would be about 3.50V.
>
>Here's another way of doing it. Charge the battery to some voltage
>below 4.2v and see how much capacity it has left:
><http://www.powerstream.com/lithium-ion-charge-voltage.htm>
>Presumably, when it's done charging, the terminal voltage will equal
>the charging voltage. At your 3.1v cutoff, the % of rated charge is
>zero. 10% looks to be about 3.75V.
>
>For LiFePO4 cells, 10% is about 3.25V.
><http://www.powerstream.com/lithium-phosphate-charge-voltage.htm>
>
>Incidentally, notice how many charges he gets if you charges to
>something less the 100% of capacity.
http://www.ebay.com/itm/220983787601
it is in a keyboard, I only charged it once.. IIRC in May 2014, it is still working..
I do see prices are now coming down for lifepo4.
>>Eh, let's see, from asm source:
>>; Lipo battery cutoff voltage in mV
>>#define BATTERY_LOW_CUTOFF_VOLTAGE D'3100'
>>
>>; Display will warn at this battery voltage level that battery needs charging
>>#define BATTERY_LOW_WARNING_VOLTAGE D'3200'
>>
>>This is what I measured on the 'Varta' marked lipos:
>> http://panteltje.com/pub/lipo_discharge_curve_low_drop_out_regulator.gif
>
>As I understand it, when the discharge curve hits the knee and starts
>to drop off rapidly, it's time to stop charging.
>
>>Now that you mention this I will try in a test-setup at a modest current (maybe 1 A) how long these new ones last.
>
>Don't forget the battery terminal clamp.
><http://802.11junk.com/jeffl/LiPo/Ultrafire%2018650%20test.jpg>
>I was getting really erratic results when I was using a battery holder
>like this:
><http://802.11junk.com/jeffl/NiMH/cba-II.jpg>
>Use the force.
for a 50 cm lead!
This has gotten me several times, finally keeping the alligator clips and soldering real wires on it.
Were not even soldered, just sort of pressed against the metal.
>>I like your big heatsink with fan battery test setup.
>
><http://www.westmountainradio.com/cba.php>
>The heat sink and fan are necessary. I accidentally dumped some loose
>junk over the fan, which then stopped. About 30 mins later, I smelled
>smoke.
>
>If you plan to build your own, please note that the CBA II has a
>design defect in that it measures the battery voltage at the wrong end
>of the test leads. At high currents, the voltage drop through the
>leads and battery contacts can be substantial. I wanted to move the
>sense wires from inside the device to the battery terminals, but never
>finished.
>For my test, I used 1.3A because that's what the flashlight I was
>testing draws at maximum brightness. I would expect your counterfeit
>cells to look very much like my counterfeit test battery:
><http://802.11junk.com/jeffl/LiPo/Ultrafire%20LiPo%203000%20ma-hr%2018650%20test.jpg>
>
>>Yes, well I meant the fuse for accidently shorting it.
>
>You might want to measure how long it will take your fuse to blow with
>a partly discharged battery and a not so perfect short, such as a
>screwdriver. A fully charged battery and a good short circuit will
>blow most any fuse or fusible link. However, that's not always the
>case when it shorts. I've had the fuse do nothing while the wiring
>got hot enough to melt the insulation. Fusible links:
><http://www1.cooperbussmann.com/pdf/01e5795a-2857-422e-85c0-62eb8b13d2c5.pdf>
depends on how much you trust your own designs...
:-)
But I think to fuse a 25 A capable lipo battery with a 1 A fast fuse is OK for what I do.
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