Nikon EN‎-EL4a Rechargeable Li‎-Ion Battery for MB‎-D10 Battery Pack and Nikon D2 and D3 Digital SLR Cameras ‎(‎Retail Packaging‎)‎‎.‎ Power your Nikon D2H‎,‎ D2Hs‎,‎ D2Xs‎,‎ and D3 digital cameras without relying on disposable batteries with the high‎-capacity Nikon EN‎-EL4a rechargeable lithium‎-ion battery‎.‎ Also compatible with the optional BL‎-3 battery chamber‎-‎-which supports the MD‎-D10 grip for the D300 and D700 cameras‎-‎-the battery employs lithium technology to ensure a maximum battery life and maximum power‎.‎ Plus‎,‎ the battery doesn‎'‎t suffer from a memory effect‎,‎ so you can recharge partially drained batteries without reducing performance‎.‎ Specifications include an output voltage of 11.1 volts‎,‎ a capacity of 2‎,‎500 mAh‎,‎ and dimensions of 3.2 by 1 by 2.2 inches ‎(‎W x H x D‎)‎‎.‎