Canon BG-E11 Battery Grip for the EOS-5D Mark III
Ergonomic battery grip allowing the use of two additional LP-E6 batteries to double the camera’s operating time. You can also use AA batteries as an emergency standby. Made of tough magnesium alloy and with waterproofing for everyday professional use.
As a vertical grip, the BG-E11 has duplicates of the AF Start, AE Lock and Focus Point controls, plus an additional command dial and multi controller.