For Canon EOS 5D Mark II DSLR the cannon battery grip is an optional battery grip designed specifically for canon EOS 5D Mark II. It gives user open choice for one or two LP-E6 battery packs. Using two packs enhances the battery life as compared to using one LP-E6 pack in-camera. It is helpful when you are using a camera in those modes which consume more battery like in movie mode etc. The BG-E6 provides vertical shooting controls which can be independently turned off or on as by user needs. Battery grip BG-E4 is not compatible with EOS 5D Mark II. With the design of the grip, it is helpful for vertical shooting and gives more ergonomic structure for holding the 70D. The main dial, multi-controller, second shutter release button and much more give the grip a versatile handling. Canon EOS 70D DSLR camera is compatible with canon BG-E14 battery grip. It provides much-improved handling and extended battery life. It can accept up to two LP-E6 lithium-ion battery packs which double the battery life. Six AA batteries can also be used for long shooting.