The nikon mb d15 battery grip is designed for the nikon d7100 dslr camera it enables seamless switching between power sources and is equipped with a shutter release button aeaf lock button multi selector and main and sub command dials for improved operation when taking photographs with the camera vertically orientated the mb d15 grip is powered by 1 or 2 nikon en el15 batteries or six ni mhlithium aa size batteries to use the mb d15 with aa batteries use the ms d14 aa battery holder w