Smatree EN-EL18A EN-EL18 Battery for Nikon D800 D800E Camera , MB-D12 MBD12 Battery Grip , 3300mAh Rechargeable Lithium-ion Battery Pack Smatree EN-EL 18A Rechargeable Lithium-ion battery, 100% Compatible with original MB-D12 battery grip Compatible with the following camera Modle: Only use in Smatree and Original MB-D12 battery grip(MB-D12 use for Nikon D800 D800E Camera) Built-In Safety Fuse - Prevents overcharging & lengthens battery life, No Memory Effect - Lets you recharge partially drained batteries Energy Storage Capacity: 3300 mAh , Voltage: 11.1 volts, Chemistry: Li-ion. Rohs,CE,FCC certified. 2 year manufacturer warranty and 30 days money back no hassel.