BXT&reg; iPhone 4 / 4s External Rechargeable Spare Backup Extended Battery Charger Case Cover for Apple iPhone 4 / 4s (2000mah, Red) High quality Ultra Slim External Li polymer battery Lithium-ion Power for iPhone 4 & 4S Standby Time:Up to 230 Hours;Capacity:2000mAh Talk Time:Up tp6.5 Hours on 3G Network / Up to 10 Hours on 2G Network; Audio Play:Up to 30 Hours;Vidio Play:Up to 8 Hours; Input:DC 5V 500mAh Output:DC 5V 500mAh