Whether your Nikon EN-EL15 battery is lost or out of commission, or you just want a spare to keep in your bag, the Re-Fuel EN-EL15 Rechargeable Lithium-Ion Battery from DigiPower is a good choice. It features 7.2V of output power, a 1550mAh capacity, and an 11.2Wh energy consumption rate. The unit will give you enough juice to capture up to 280 photos per charge. Lithium-ion batteries can be charged or discharged at any time without developing memory effect.