The Series 7 SL-E6 Rechargeable Lithium-ion Battery is a 7.4v, 1800mAh battery pack which works with the same cameras as the Canon LP-E6, and can also charge on the Canon LC-E6 charger. The SL-E6 battery can also communicate with the camera allowing you to check the remaining capacity on the camera's power source information screen.
Note:
The SL-E6 does not have the data chip necessary to provide storable information on the Canon 5D Mark II and 7D's battery registry screen
Temperature and current fuse protection
Communicates remaining power capacity to the camera, which is then displayed on the camera's power source information screen