Battery ID chip - help needed

[Paul Fertser]

Christian Gagneraud <cgagneraud at techworks.ie> writes:
> According to the FR battery page [1], they say that FR use a smart 
> battery (model number CT-GTA02 [2]) but i can tell you that i don't 
> have such a thing in my phone, i actually have a battery marked 
> "Model: GTA02", which is definitely not a smart battery (it has only 3 
> pins), this battery correspond more to what's describe on the Neo 
> battery page [3]. Moreover, the schematics of the FR show that it use 
> only 2 signals of the battery: V+ and V-.

The third terminal is used by a bit-banging HDQ driver which
communicates with bq27000 chip integrated in battery. And it works for
sure, though probably some eeprom values that should be
factory-programmed are not optimal.

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