Vello
BG-C9 Battery Grip
For Canon EOS 5DmkIII, 5DS & 5DS R
The BG-C9 Battery Grip from Vello is designed for use with your Canon EOS 5DmkIII, 5DS, or 5DS R digital SLR cameras. It features an alternate shutter release button, AF start button, AF point selection, AE lock/FE lock button, multi-controller button, multi-function button and main dial to make vertical shooting easy. The grip accepts two LP-E6 Canon batteries to double your standard shooting time, and can also function with just one battery. Alternatively 6 AA batteries can be loaded in the secondary battery magazine to provide up to 400 shots. It can also be used with the separately available Canon AC Adapter Kit ACK-E6, which provides an uninterrupted power supply.
To install the grip simply remove the battery from your camera and detach the battery door. A camera battery door holder is available to store the camera's battery chamber door when the grip is mounted. The grip then slides into the battery compartment and locks into place via the tripod socket screw. The base of the grip offers its own tripod adapter thread, should it be needed.