Amp Charger. This battery backup will keep your smartphone charged up when needed. With a 2,200 mAh battery and a 5V/1A output this charger will fully charge a Smart Phone giving you an additional 8 hours of talk time. Includes a USB to Micro USB connecting cable which can recharge the battery backup or be used to charge up devices with a Micro USB input from Android Smartphones. Rechargable lithium-ion battery included and inserted.