Sooo... I may have blown up my battery.

François-Léonard Gilbert gilbertf at
Fri Dec 11 13:59:36 CET 2009

I tried that technique last night, and while I did wake the battery  
up, it was not enough to start the phone.

What I did:
1) get 4 1.2v AA batteries in series with a resistor and a LED (for  
visual confirmation and current limiting)
2) plug the 4.8v in parallel with the FR battery (+ with +, - with -)  
this lighted up the LED
3) wait 2-3 minutes
4) try to plug the led + resistor between the FR terminals: very faint  
light, but OK
5) plug the FR in my computer, put the battery in, power up the NAND  
boot menu
6) cycle the menu items for a few seconds

result: the FR shuts down while I cycle the menu.

Any suggestions?


Le 09-12-03 à 07:34, Werner Almesberger a écrit :

> Al Johnson wrote:
>> The only reliable method on my A5 is to jump-start the phone with  
>> another
>> LiIon battery.
> If you've driven your GTA02 battery into cut-off (no voltage between
> the terminals), then you can also jump-start the battery by supplying
> a bit of energy from an external source, e.g., a battery pack at ~4 V
> through a 1 kOhm resistor should do.
> When the protection circuit inside the battery detects the external
> power, it exits cut-off mode. This results in a non-zero voltage
> (3.something volt) appearing between the battery terminals.
> When the battery comes out of cut-off, you can draw a bit of power
> before it enters cut-off again. So you should be able to boot and
> proceed with the normal charging process.
> - Werner
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