The BG-E13 Battery Grip for Canon ;EOS 6D ;from ; Canon ;is a ;battery grip designed for use specifically with the Canon EOS ;6D digital SLR camera ;and accepts one or two Canon ;LP-E6 batteries. With two batteries installed, your shooting time is effectively doubled. Moreover, when one battery is drained, it can be removed and recharged while you continue shooting ;with the other battery. In addition, the BG-E13 ;can utilize ;6 AA batteries and comes with a battery tray designed to hold 6 AA/LR6 batteries. It can also be powered by the optional ACK-E6 AC Adapter Kit. The curved design of a battery grip offers a comfortable and secure way in which to hold your DSLR, especially in the vertical position. And the BG-E13 comes with an alternate shutter release button, AF start button, AF point selection button, AE lock/FE lock button, multi-controller, multi-function button and main dial ;to facilitate shooting when held vertically. The BG-E13 is designed with anti-slip rubber grip to further improve handling, a tripod socket to mount ;your camera directly to a ;tripod and a wonderful touch: a holder for the camera's battery door so as not to lose it when the battery grip is installed.