Re: Rechargeable AA Batteries
Soundhaspriority
> Soundhaspriority wrote:
>
>> I use both the Eneloops (AAA) and the Hybrio AA. Good experiences with
>> both.
>
> The Hybrio cells claim to hold their charge (unused) for upwards of 6
> months, but I can't figure out what's supposed to be the Eneloop claim
> to fame other than that a lot of people recommend them. I think I've
> only seen 2000 mAh AA Eneloops but I've seen up to 2700 mAh in standard
> cell types. The extra charge might be worth while, but it's hard to tell.
The claim to fame is that pros like me use them. I try to take all the
suggestions of pros, because that's how you show the clients you're a
professional.
I wear Gore-tex for the same reason, that's what is recommending by the
pros. Although I can't quite get used to the scratchy feeling of the
Gore-tex underwear. But it does keep the urine contained quite well.
Bob Morein
(310) 237-6511
Boomboom
I actually got the usual ones (with orange on the negative pole); how
much more time do the Eneloop really hold up with their inferior
2000mAh vs. 2500mAh I already got with my batts in real life ? Let's
say, in a 2x AA Transmitter ? One hour? 30 minutes? 5 hours?
Allen
life after charging. Most NiMH lose charge at a fairly fast rate after
charging, but Eneloops and Rayovac hybrids will remain useful for
perhaps a years after charging and lying around unused.
Allen
Julien BH
I used it in my point and shoot camera and I must say I'm impressed.
Same thing goes for my wii remotes. It lasts almost the same time as
normal batteries (non-rechargeable).
Also they keep their full charge for a pretty long period of time.
Morton
Hi,
You apparently missed the point. The Eneloops hold their charge for a
year or more, when not in use, = shelf life. Normal NiMH cells lose
their charge over a few weeks when not in use. We are not talking about
how many minutes or hours they function when in use.
Morton
Boomboom
Got it, but this publicity made me think that *maybe* the 2000mAh
would be as performant in terms of function time as the 2500mAh. I
know what these numbers mean but, well, have a look at the link... :)
vdub...@earthlink.net
> The great advantage Eneloops have over older NiMH batteries is
shelf
> life after charging. Most NiMH lose charge at a fairly fast rate after
> charging, but Eneloops and Rayovac hybrids will remain useful for
> perhaps a years after charging and lying around unused.
> Allen
People who don't put in batteries lying around charged months ago may
think it doesn't apply to them, but for devices that don't draw
continually I've been getting very nice useful operating times over
time with them. Even aside from how many shots a camera will take on
a set, or how long a recorder will record, there's a healthy
difference with them using the device a month later when they were
only half expended during last use.
I'm a convert.
.
tho...@antispam.ham
> The Hybrio cells claim to hold their charge (unused) for upwards of 6
> months, but I can't figure out what's supposed to be the Eneloop claim
> to fame other than that a lot of people recommend them.
The Eneloop claim to fame is the same as the Hybrio claim to fame:
very low self-discharge rates. And apparently Sanyo, the maker of
Eneloop batteries, is the company that developed the technology.
> I think I've only seen 2000 mAh AA Eneloops
That's a conservative rating. I have several that have 2100 mAh capacity
(under a 300 mA load).
> but I've seen up to 2700 mAh in standard cell types.
I've seen up to 2900 mAh. But I haven't seen any of those retain that
level of capacity for very long. I've tested some Powerex 2700 mAh
cells, and their capacities are down to 2200 mAh or so after just a
couple dozen cycles.
> The extra charge might be worth while, but it's hard to tell.
Only if you use that extra charge right away. I have some Sanyo 2700 mAh
cells that are dead just a few days later, whether you use them or not.
tho...@antispam.ham
Depends on the current draw. Theoretically, a 2000 mAh cell will last
only 80 percent as long as a 2500 mAh cell. However, if the 2500 mAh
cell is of the standard NiMH type, and the 2000 mAh cell is of the
low self-discharge type, then the 2000 mAh cell could last quite a bit
longer than a 2500 mAh cell, if they first both sit on the shelf for a
month after being charged.
fatfatjames
I Love Powerex 2700mAh AA even the 2100mAh AAA are very good
William Sommerwerck
Why is everyone some exercised over the "shelf life" of a charged
rechargeable battery? Why is this so important?
The rated mAh capacity is taken at a relatively low drain -- 50mA or so, I
think. So a 2500mAh cell will run 50 hours at 50mA. But at 1000mA, you
probably wouldn't bet much more than one hour out of it.
tho...@antispam.ham
>>> I had the same question concerning the Sanyo Eneloop batteries...
>>> I actually got the usual ones (with orange on the negative pole); how
>>> much more time do the Eneloop really hold up with their inferior
>>> 2000mAh vs. 2500mAh I already got with my batts in real life ? Let's
>>> say, in a 2x AA Transmitter ? One hour? 30 minutes? 5 hours?
>> Depends on the current draw. Theoretically, a 2000 mAh cell will last
>> only 80 percent as long as a 2500 mAh cell. However, if the 2500 mAh
>> cell is of the standard NiMH type, and the 2000 mAh cell is of the
>> low self-discharge type, then the 2000 mAh cell could last quite a bit
>> longer than a 2500 mAh cell, if they first both sit on the shelf for a
>> month after being charged.
> Why is everyone some exercised over the "shelf life" of a charged
> rechargeable battery? Why is this so important?
Have you ever put an unused (since its last charge) battery in a device
only to have it not operate for very long or at all? That's because the
battery discharged while it was sitting there unused. If you always have
time to charge batteries before they're needed, you're okay, but if you
want to just grab some batteries and expect them to work, then either
grab primary (disposable) cells or rechargeable ones of the low
self-discharge variety.
> The rated mAh capacity is taken at a relatively low drain -- 50mA or so, I
> think.
Standard (IEC) procedure for measuring the capacity of a rechargeable
battery is to first charge it at 0.1C for 16 hours, wait an hour, then
discharge at 0.2C and see how long it lasts. [N.B. The battery companies
apparently haven't yet figured out the unit inconsistency of charging at
0.1C and discharging at 0.2C.]
> So a 2500mAh cell will run 50 hours at 50mA. But at 1000mA, you
> probably wouldn't bet much more than one hour out of it.
Depends on what you select for your terminal voltage. At that drain,
it'll drop to 1.2 volts rather quickly, but at least the AccuLoop
people expect their cells to last for about 2.5 hours down to a
terminal voltage of 1 volt.
tho...@antispam.ham
>> Boomboom <compre55...@hotmail.com> wrote:
>>> I had the same question concerning the Sanyo Eneloop batteries...
>>> I actually got the usual ones (with orange on the negative pole); how
>>> much more time do the Eneloop really hold up with their inferior
>>> 2000mAh vs. 2500mAh I already got with my batts in real life ? Let's
>>> say, in a 2x AA Transmitter ? One hour? 30 minutes? 5 hours?
>> Depends on the current draw. =A0Theoretically, a 2000 mAh cell will last
>> only 80 percent as long as a 2500 mAh cell. =A0However, if the 2500 mAh
>> cell is of the standard NiMH type, and the 2000 mAh cell is of the
>> low self-discharge type, then the 2000 mAh cell could last quite a bit
>> longer than a 2500 mAh cell, if they first both sit on the shelf for a
>> month after being charged.
> I Love Powerex 2700mAh AA
I have a set of eight. Here's a sample of the measured capacity every
other discharge cycle:
2702 mAh
2598 mAh
2532 mAh
2441 mAh
2412 mAh
2366 mAh
2350 mAh
2310 mAh
2273 mAh
They have better shelf life than the Sanyo 2700 mAh cells, but the loss
of capacity is surprising.
> even the 2100mAh AAA are very good
I haven't seen any AAA over 1000 mAh.
Martin Griffith
tho...@antispam.ham wrote:
Ansmann 5035221 rated at 1100mAh
martin
tho...@antispam.ham
>> fatfatjames <fatfa...@gmail.com> wrote:
>>>> Boomboom <compre55...@hotmail.com> wrote:
Way short of 2100 mAh.
Wayne Brown
>
> Why is everyone some exercised over the "shelf life" of a charged
> rechargeable battery? Why is this so important?
One reason is that Eneloops come pre-charged from the factory, so
they don't need to be charged for several hours before the first use.
I can buy a package of Eneloops that were manufactured in late 2006
(as most of them available on the retail market are at present), put
them straight into a device just as I would with new alkaline batteries,
and expect them to last for days or weeks (depending on usage). As soon
as they're dead, I can recharge them and toss them in a drawer, confident
they'll be ready to use next month, or next season, or next year.
I don't buy alkaline batteries anymore. My flashlights, portable CD
player, calculator, the portable printer that goes with the calculator,
the book light I use for reading at night, and most of the other small
devices I have are powered by Eneloops now. Whenever I need fresh
batteries I grab some from home or my desk at the office, or pick up
a new package from the store, without having to worry about whether or
not they're ready to use when I need them.
--
F. Wayne Brown <fwb...@bellsouth.net>
Þæs ofereode, ðisses swa mæg. ("That passed away, this also can.")
from "Deor," in the Exeter Book (folios 100r-100v)
William Sommerwerck
>> you probably wouldn't bet much more than one hour out of it.
> Depends on what you select for your terminal voltage. At that drain,
> it'll drop to 1.2 volts rather quickly, but at least the AccuLoop
> people expect their cells to last for about 2.5 hours down to a
> terminal voltage of 1 volt.
"Terminal" terminal voltage is traditionally 1 volt, sometimes 0.9 volts.