Laza Zcell Samsung Galaxy S4 5200mAh Extended Battery With NFC + Back Cover (Compatible with ALL Samsung Galaxy S4 Models. Samsung Galaxy S IV, Sprint, AT&T, T-Mobile, US Cellular, Verizon, Cricket, Boost, Virgin and All International Models) Black Zcell powered are accurately rated batteries so that means they have every drop of power they say they do. They feature high capacity, top quality and more charge cycles. Our 5200mah high capacity battery extends your Samsung Galaxy S4 battery life. Exquisite battery and cover design. Battery made from high quality Zcell lithium cells. Includes replacement back cover with stylish finish. Capacity: 5200mah ACTUAL CAPACITY, WE DO NOT SKIMP ON POWER.