This battery is perfect for troubleshooting, it can charge (on average) once your phone. The size is really small. The rather nice thing was the USB cable (green) that can charge your phone, integrated directly into the battery and no way to forget it. An On / Off button is used to check your battery by four LEDs, with a lighting of 1 to 4 to inform the battery level. To recharge the mini battery comes in addition, a small standard USB cable.