Nikon EN-EL4 Rechargeable Li-Ion Battery for MB-D10 Battery Pack and Nikon D2 and D3 Digital SLR Cameras (Retail Packaging) Nikon Branded Retail Package Offers a rated capacity of 11.1 volts/1,900 mAh Charging time of approximately 100 minutes Works with Nikon D2 and D3 digital SLR cameras Compatible with D300 camera using MB-D10 battery pack