Simple Studio Speed Lite Power Box for Nikon Average battery life one 1 charge is 1000 flashes with a recycle time of 0.5 seconds Battery charging time: 2 hours Battery: Li-ion 12V-2000mAh Output: DC-320V Fits Nikon SB28DX, SB80DX, SB800, SB900. Please check for 3 prong plug on your flash unit.