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Originally Posted by diabloNL
Does anybody know why the battery has only got 2 wires. Doesn't Li-ion need a third one for data?
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The third terminal is only 'data' on battery packs with integrated charge monitoring electronics, i.e. Sony InfoLithium or Notebook battery packs. Simple battery packs (i.e. for mobile phones or camcorders) usually have an integrated temperature sensor (simple passive NTC resistor) connected to the third terminal. This is intended for monitoring battery temperature during charging. Non-changeable internal Li-Ion batteries usually only have 2 terminals, because the device manufacturer usually puts the temperature sensor somwhere in the battery compartment and connects it directly to the charging circuit.
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