mobile accessories for galaxy s4 extend battery case original factory Specification*Cell type:Lithium-polymer batteryREMARK:Tincom technology Co., Ltd is a manufacturer ofextra power in Shenzhen, China.We offer many kinds of battery cases for Iphone 5, Iphone 4, Iphone 4S, Sumsung, Ipad, etc.Pls feel free to contact with us to know more about our products!