Laza Zcell Sprint Samsung Galaxy S2 Epic Touch 4G D710 4200mah Extended Battery and Back Cover (Sprint, Boost, Virgin, Cricket, US Cellular, CDMA) (NOT Compatible with i9100, i727, t989, i777) Black (NOT Compatible with i9100, i727, t989, i777) 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 Zcell 4200mah high capacity battery extends your Sprint Samsung Galaxy S2 Epic Touch Battery Life. Exquisite battery and cover design. Battery made from high quality Zcell lithium cells. Includes replacement back cover with stylish finish. Capacity:4200mah ACTUAL CAPACITY, WE DO NOT SKIMP ON POWER.