For the Nikon F65. The MB-17 connects to the tripod socket on the F65 base and it accepts four 1.5V LR6 (AA-size alkaline), 1.5V FR6 (AA-size lithium), 1.2V KR-AA (AA-size NiCd) or 1.2V AA-size Ni-MH batteries. This battery pack provides a more consistent performance even at low temperatures by increasing the number of shots per set of batteries.