Canon LP-E6 Rechargeable Lithium-Ion Battery

The LP-E6 battery also communicates with the EOS 5D Mark II, 60D and 7D digital cameras, so that you can always check the remaining capacity on the camera's power source info screen. In addition, a unique feature of the LP-E6 battery pack is that it has a microchip encoded with an 8-character serial number. So when the battery pack is installed in the camera, you can register it using a menu command.