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Nikon EN-EL9a Rechargeable Lithium-Ion Battery for Nikon D5000, D3000, D40X, D40, D60, D3X
Use the Nikon EN-EL 9a Battery to power select Nikon digital cameras. Equipped with 7.2 V and 1080 mAh of power, this rechargeable Li-ion battery keeps your camera charged for a long time. This lithium-ion Nikon battery has a low self-discharge rate that helps it retain its charge for a long time. You can charge it using the MH-23 quick charger.