The Canon BG-E11 Battery Grip for EOS 5D Mark III/5DS and 5DS R is made from magnesium alloy and is designed for photographers who want to shoot for longer. The ergonomically designed BG-E11 grip doubles the battery life with two additional LP-E6 batteries, with the added flexibility of using AA batteries as an emergency back-up. For those who like to shoot vertically, such as sports or portrait photographers, duplicate AF start, Focus point and AE-lock controls in addition to a second Multi Controller and Control Dial makes shooting vertically a more comfortable and intuitive experience. Batteries not included.