The canon bg e13 battery grip is an optional battery grip with improved ergonomics designed specifically for the canon eos 6d it allows users to load a choice of one or two lp e6 battery packs with two packs the already impressive battery life is doubled compared to using a single lp e6 pack in camera in addition with the included battery magazine you can also run the camera off six aa batteries with a large number of operating controls including shutter button main dial multi controller af poin