Hyperion Sprint HTC EVO 4G 2x Battery + Travel Charger (Also Compatible with Evo Shift, Verizon HTC Droid Incredible, Sprint Hero, Touch Pro2, Snap, Ozone) Easily swap your battery when your charge is low. The battery has 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.