Use of this battery grip also facilitates more comfortable handling when shooting in portrait mode. The grip features alternative shutter-release, multi-selector and AF start buttons for use when holding the camera in the vertical shooting position, as well as secondary main- and sub-command dials. It can be powered by Nikon’s EN-EL15 Li-ion battery or six AA-size standard batteries. When using the optional BL-5 battery adapter, the MB-D17 can also be powered by Nikon’s EN-EL18/EN-EL18a Li-ion batteries, which are compatible with Nikon’s flagship D4-series cameras and the D5.