The Canon LC-E4 Battery Charger can charge two LP-E4 battery packs simultaneously and provides a charging time of about 120 minutes when recharging one battery. When in use, the charger performs battery capacity calibration so that the remaining battery level can be indicated accurately when used in the EOS 1D Mark III camera. The LC-E4 charger is also compatible with DC power (12V/24V), when it is connected to a car power socket with the optional CB-570 Car Battery Cable.