Smatree MB-D12 MBD12 Nikon Battery Grip(1pcs) + EN-EL18A ENEL18A Battery (1pcs)3300mAh for Nikon D800 D800E Camera Smatree EN-EL18A battery energy storage capacity: 3300 mAh , voltage: 11.1 volts, chemistry: Li-ion. Smatree EN-EL18A and MB-D12 battery grip compatible with Nikon D800/D800E Camera. Smatree EN-EL 18A Rechargeable Lithium-ion battery, 100% Compatible with original MB-D12 battery grip and Smatrees MB-D12 battery grip Smatree MB-D12 battery grip can hold 1 x EN-EL15 battery packs or 8 x AA batteries to provide approximately twice the shooting capacity of the camera alone 2 year manufacturer warranty and 30 days money back no hassel.