Kastar High Capacity EN-EL9 Replacement Lithium-Ion Battery for Nikon EN-EL9 EN-EL9a EN-EL9e Battery, MH-23 Charger and Nikon D40 D40X D60 D3000 D5000 SLR Camera Kastar replacement battery for Nikon EN-EL9 EN-EL9a EN-EL9e battery Battery Type: Lithium-Ion; Battery Voltage: 7.4V Battery Capacity: 2000mAh Package Includes: 1 Battery Integrated microchip prevents overcharging and lengthens battery life