The nikon mb d16 is an ergonomically designed battery grip for the nikon d750 dslr camera the mb d16 multi power battery pack extends autonomous operating time and facilitates more comfortable handling when shooting in portrait mode the pack 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 is powered by six aa size standard batteries via the d16 aa ba