Vivitar BG-E16 Pro Series Multi-Power Battery Grip EOS 7D Mark II DSLR Camera Effectively doubles your shooting time -- Holds either 2 LP-E6 batteries or 6 AA batteries Vertical firing release with M-Fn button and dial -- Vertical AF start button Vertical grip AF point selector/enlarge button -- Vertical grip AE lock/index/reduce button Attachment wheel -- Tipod socket/mounting screw Significantly improves stability