EN-EL20 Rechargeable Lithium-Ion Replacement Battery Pack - (1200 mAh 7.2V) - Replacement Battery For Nikon EN-EL20 Rechargeable Battery Replacement battery for the Nikon ENEL20, Lithium-Ion (Li-ion) 7.4V (1200mAh) 100% compatible with your OEM battery - 3 year warranty. Made with high quality Japanese cells. Synergy Digital is a Registered Trademark