Canon Battery Charger LC-4E Compact charger for EOS 1D Mark III Can charge two LP-E4 battery packs simultaneously Takes about 120 minutes to recharge one battery pack Performs battery capacity calibration with LP-E4 battery pack so that the remaining battery level can be indicated accurately Compatible with DC power (12V/24V), can be connected to a car battery with Car Battery Cable CB-570 to recharge the battery pack