Energizer ENB-NEL20 Digital Replacement Battery EN-EL20 for Nikon 1 J1 and J2 (Black) Replaces the Nikon EN-EL20 Li-ion Battery Battery Specs: 7.4V 1020mAh Compatible with Nikon 1 J1 & J2 mirror less camera series Can be used with original lithium-ion battery charger This Li-ion battery is 100% memory-free and will not suffer from the inconvenient memory effects that are typically associated with similar battery types.