Nikon CP1 and EN-EL5 Batteries by Amstron are designed for use with Nikon Coolpix 3700/ 4200/ 5200. Amstron Digital Camera batteries are precision-engineered and rigorously tested for voltage, capacity, compatibility, and safety to exceed original equipment manufacturer specifications. • Chemistry: Li-Ion • Ratings 3.7 Volts 1000mAh Capacity. • Warranty: 4 Years