Laza Zcell Sprint HTC EVO 3D 4G 2x Battery + Charger + Travel Case Combo Fits HTC Evo 3D 4G Sprint Easily swap your battery when your charge is low. Never run out power again when at work, school, vacation or out with friends. The battery has an integrated microchip to prevent overcharging and lengthens battery life. Excellent quality at a great price. The charger will keep your extra batteries charged for when you need them. The smart led shows charging status. Quick charge with automatic constant current control prevents battery from overcharging, short circuit, and electronic shock. Charger is designed with a foldable A/C plug that charges your cellphone battery anywhere in the world 2 x Battery and 1 x Wall Dock Charger. Do not need to change back cover