Originally Posted by SDRebel
yes, it's very unlikely that it will blow up, but we still don't know what the device interacts with the battery using the third pin, so it's hard to tell if it will work.
That third pin probably allows communication with a microchip in the battery...
Generally the third pin is a temperature sensor to avoid overcharging the battery. You can tell that with a voltmeter as well. It will output a voltage that can be sensed.