Wasabi Power Battery for Nikon EN-EL4, EN-EL4a and Nikon D2, D2H, D2Hs, D2X, D2Xs, D3, D3S, D3X, F6 Rechargeable lithium-ion battery for Nikon EN-EL4 and EN-EL4a Rated at 11.1V and 3000mAh for longer battery life Premium Japanese cells for longer battery life with no memory effect Fully compatible with the Nikon camera and charger -- D2, D2H, D2Hs, D2X, D2Xs, D3, D3s, D3x, F6 Includes battery with 3-year manufacturer warranty