Buy from Amazon.com : http://fave.co/1F0ztX7
Xit XTNG800 Pro Series Battery Power Grip for Nikon D800 Digital SLR Cameras (MB-D12) (Black)
Product Description :
Effectively Doubles your Shooting Time
Holds 1 EN-EL15 Battery
8 AA Cartridge Included
Vertical Shutter Release
