Hyperion 2x Battery + Travel Charger for Samsung Sprint Epic 4g, Galaxy S, Fascinate, At&t Captivate, At&t Focus i917, T-mobile Vibrant, ATT Focus i917, I9000, I897, T959 High Quality Battery for the Samsung Galaxy S i9000 series, Sprint Epic 4G, Verizon Fascinate ***see note in product details***, AT&T Captivate i897, AT&T Focus i917, T-mobile Vibrant t959 Easily swap your battery when your charge is low. Hyperion batteries have an integrated microchip to prevent overcharging and lengthens battery life. 2 x 1500mAh Battery and 1 x Universal Wall Dock Charger. Do not need to change back cover. The Smart LED shows charging status. Quick charge with automatic constant current control prevents battery from overcharging, short circuit, and electronic shock.