The 7.4V, 1000mAh Pearstone EN-EL9A Lithium-Ion Battery Pack replaces the Nikon EN-EL9A battery. Small and lightweight, this rechargeable lithium-ion battery can be charged or discharged at any time without developing memory effects, meaning it will never lose its ability to hold a full charge. It has a voltage of 7.4V and a capacity of 1000mAh.