EN-EL19 Rechargeable Lithium-Ion Replacement Battery Pack - (1000 mAh 3.7V) - Replacement Battery For Nikon SD-ENEL19 Rechargeable Battery Replacement battery for the Nikon ENEL19, Lithium-Ion (Li-ion) 3.7V (1000mAh) 100% compatible with your OEM battery - 3 year warranty. Made with high quality Japanese cells. Synergy Digital is a Registered Trademark