Bower XPDNEL18 Digital Camera Battery for Nikon EN-EL18 D4 DSLR Camera (Grey) Rechargeable Li-ion replacement battery for the Nikon EN-EL18 10.8V and 4000 mAh 100% memory-free for full charge at any battery level Fully compatible with Nikon MH-18a original battery charger Designed for Nikon D4 DSLR cameras