SDENEL4 Lithium-Ion Battery - Rechargeable Ultra High Capacity (11.1V 2200 mAh) - Replacement for Nikon EN-EL4 Battery Replacement battery for the Nikon ENEL4, Lithium-Ion (Li-ion) 11.1V (2200mAh) 100% compatible with your OEM battery - 3 year warranty. Made with high quality Japanese cells. Synergy Digital is a Registered Trademark