The 3.7V, 700mAh Pearstone EN-EL19 Lithium-Ion Battery Pack replaces the Nikon EN-EL19 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 3.7V and a capacity of 700mAh.