Nikon EN-EL4a 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/2,500 mAh Fits Nikon D2H, D2Hs, D2Xs and D3 digital cameras Supports BL-3 battery chamber for D300 and D700 cameras No memory effect; measures 3.2 x 1 x 2.2 inches (W x H x D)