Canon BG-E11 DSLR Battery Grip for 5D mk III

Getting more much-needed time
The BG-E11 Battery Grip from Canon is an optional battery grip for the Canon 5D Mark III. It allows users to load a choice of one or two LP-E6 batteries. With two batteries, battery life is doubled, compared to using a single LP-E6 camera. This is especially useful when taking advantage of the camera's movie mode or Live View mode - operating modes that use more power.
Grip Features
In addition, with the included battery magazine, you can also run the camera off six AA batteries. The BG-E11 also provides full vertical shooting controls, which can be independently turned on or off as the photographer needs to enhance camera handling, especially for shooting vertical pictures. Operating controls include a shutter button, Main Dial, multi-controller, AF point selection button, AE lock/FE lock button, AF start button, and multi-function button.