Battery Holder Grip for Nikon D800, D800E, D810. It's equipeped with an alternate shutter-release button, AF-ON button, multi selector, and main + sub-command dials for shooting in a vertical position. This battery grip can hold one EN-EL15 rechargeable LI-ION battery, in addition to the camera's internal battery, holding a total of two EN-EL15 batteries (not included). If you need additional batteries for this battery grip, click here. Eight AA batteries (Alkaline LR6,NI-MH HR or Lithium FR) can be used instead for more convenience.