The 2,000 mAh keychain-sized USB Backup Battery provides maximum portability without sacrificing functionality and features. This 1-amp charger provides power to your mobile device via a single USB output with auto shutoff, preventing overcharge. The battery-level indicator and built-in LED flashlight make this Backup Battery a must-have.BDSIGPH20W. IGPH20W. Gonplug GONPLUG GP-H20W 2,000 mAh USB Backup Battery.