Running a Garmin Edge 705 on an External Battery
Andrew Mead
Has anyone discovered the secret to *running* a Garmin Edge 705 while using an external battery to overcome the 15 hour battery life?
The Edge goes into charge mode when I connect an external battery. Charge mode shuts off all the other functions which renders the GPS useless.
15 hrs is great for a 200k, leaves little room on a 300k, and likely renders the GPS excess baggage on anything longer.
Thanks.
Andrew (shoulda gone for an eTrex Vista HCx instead) Mead
Pennsylvania
Bob the Wheelbuilder
http://groups.google.com/group/randon/browse_thread/thread/e0ba4f5cce43d5a3#
Kole Kantner
You need a special USB cable that has the extra pin connected to the
negative pin by a 100kohm or smaller resistor. Almost all of the
chargers for phones and Garmin devices have the proper cable. General
mini-USB cables will not work as you have seen. I find the hub charging
adapter extremely convenient since I never have to take the Garmin off
to charge it. Many others use various USB battery adapters, but not all
have the proper wiring. You can probably cut the cable off of an AC
charger that powers the Garmin in operation mode and connect it to your
battery pack. A little soldering and heat shrink tubing should take
care of it. Costco did have 2-packs of the Duracell AA-USB adapters for
$7.97 up until a few months ago. I haven't checked recently, but they
were having a hard time selling them even at that price.
--Kole--
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Jim House
I just finished a 300K yesterday. I have a cheep one AA cell device. I
used self sticking Velcro to the battery device and hang it between my front
cables wraping the battery device with the male side of the Velcro strips.
Then plug it directly into the Edge 705 where the Edge is mounted onto my
bike stem. It works great. I also have the Energizer 2 AA charger but like
the single cell charger better. Both cost under $10.00 and work great. The
problem with both is that the charging cable is only 4 inches long - I would
like a longer cable so I could let the batter charger roll around in my
front bag or stick it someplace else other than dangling from my front end
cables.
Also there is a new DURACELLR Instant Power Charger - HAS ANYONE TRIED THIS
ITEM?
You could plug in your full size Garmin USB cable and the mini USB into the
Edge for a longer cable solution.
http://www.duracelldirect.com/dr7000li.aspx
Also see the video linked on this page.
Good luck,
Jim House
Maumee, OH
Andrew,
--Kole--
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Andrew Mead
My aux ower supply is a 4 AA cell holder with a regular USB A connection by Boxwave. Works great with a Blackberry.
I have a regular USB connector cable with an angled mini-USB plug for the GPS that points the cable back along the stem. Battery pack resides in a Bento box. At least that was the plan.
It would appear as though a modified cable would be required. I have yet to see a USB A to USB Mini B connector specifically adapted for power supply only. But it's not as though I've been looking either.
Andrew
adm...@gmail.com
Kole Kantner
That new Duracell device looks nice and small, and handy with the long
power cable. However, 5Wh is pretty limited. The Garmin 705 has a
4.6Wh battery in it, so with transfer losses it wouldn't even double the
operating time. It might cover travel time on a 600k, but certainly
nothing longer. Carrying a charger to top off at food stops or
overnights would help, but a hub charger would be much more convenient.
I don't use AA battery adapters, but I suspect those would also be more
convenient, particularly with the ability to get replacement batteries
almost anywhere.
--Kole--
cheg
] on rides up to 600k and could go as long as necessary by changing
batteries. The key for me has been to turn the unit on by plugging in
the external battery rather than plugging in the battery after the
unit is power up. If I do that it operates normally and shows that the
unit is under external power. For some reason the 705 sees the
charger as a data transfer port if it is plugged in later. I do have
to check the 705 charge level periodically to see when the internal
battery starts to drain so I know when to change batteries in the
minty boost.
BTW: 15 hours will become fewer as time goes on and cold temperatures
also reduce internal battery life.
On Apr 12, 6:38 am, Andrew Mead <adm...@gmail.com> wrote:
> Has anyone discovered the secret to *running* a Garmin Edge 705 while using
> an external battery to overcome the 15 hour battery life
> The Edge goes into charge mode when I connect an external battery. Charge
> mode shuts off all the other functions which renders the GPS useless.
>
> 15 hrs is great for a 200k, leaves little room on a 300k, and likely renders
> ty Boostthe GPS excess baggage on anything longer.
Roger Peskett
cable to link to the APC UPB10 Mobile Power Pack, which is described
by Mike Enfield here: http://www.mikeerides.com/Garmin705.htm
With this arrangement, if the power pack is connected while the timer
is running, the Garmin's functions do not shut down.
On Apr 12, 6:38 am, Andrew Mead <adm...@gmail.com> wrote:
Kole Kantner
I'll have to try that trick with the timer on other cables. Even though
I have a sufficient number of USB power cables now that cost less than
$6 on eBay with the included DC-DC power converter, alternatives are
always appreciated. Thanks for the useful report!
--Kole--
Andrew Mead
1. My Edge goes into charge mode if the Garmin AC charger is connected while the unit is running. If I connect the charger first and then turn on the Edge, it seems to work fine. I'm concluding that whatever system I choose must be connected prior to powering up the Edge to avoid a reset of the unit.
2. The BoxWave power supply connects ONLY the outboard pins (+/- 5V) of the USB connection. There are no resistors connecting to the data wires. In fact, the internal cable between the circuit board and the USB plug appears to have only 2 conductors. I've concluded that the BoxWave is NOT the ideal power supply for this application.
3. I'm looking around for the EnergizertoGo power supplies. Even though limited to 2 batteries, if I can get the Edge to last for 400-600k, it will last as long as I do. I can recharge the Edge while I'm recharging.
Remaining questions:
Does anyone know of a battery pack that has a USB output already having the resistor connections to the data pins so that the nifty USB A to angled mini USB B plug cable that I have would work to charge the Edge 705 while running?
Thanks,
Andrew
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Andrew Mead
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Kole Kantner
Standard mini-USB cables never have any wire connected to that non-standard extra pin next to the negative and hence will will not work for operating power no matter what extra circuit you connect them to. For that reason you need a special cable that does connect something like a resistor to that non-standard pin. I have checked out a few general mini-USB cables and none had a wire connected to that pin. The main reason is probably that the full sized USB plug has one less pin and there isn't any logical place to connect that extra pin to. Ideally there would be cables available that had the resistor already in the circuit, but it is a fairly specialized market that does not seem to be served yet.
--Kole--