My experience of charging LiPo batteries has always been in conjunction with an intelligent LiPo charger. These intelligent chargers use connections to the three cells which make up an 11.1v LiPo to ensure that the charge is balanced across the three cells. The charger supplied with the Phantom 2 battery would appear to have only two connections to the battery, from what looks like a simple 12v power supply. I guess that the intelligence is held within the battery itself, which might be why the battery is so expensive. If this is the case, why can't we charge the battery from the twelve volt supply in a car (by cutting the charging cord and making up an adapter so that it could be switched between the mains or 12v source. (Just make sure that you have at least 4 amps available on your connection to the car). I haven't done this yet as I haven't yet needed to charge the batteries away from home. I would appreciate anyone thoughts on this... BTW, does anyone fly quads near Sheffield in the UK??