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 MB-D10 MB-40 grip for the F6/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.