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

Werner Almesberger werner at
Thu Dec 3 13:34:10 CET 2009

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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