Progo Brand EN-EL19 Professional Li-Ion Rechargeable Digital Camera Battery for Nikon Coolpix S4100 Progo Brand Battery, 100% Compatible with original manufacturer equipments, guaranteed! Integrated microchip prevents overcharging, overheat & provide short circuit protection. High quality Li-Ion battery cell. 3.6v, 1000 mAh Capacity Absolutely no memory effect so that you can charge battery at anytime 12 months USA warranty