Liying&reg; Brand New High Capacity 2200mah External Battery Charger Case Cover - For Iphone 4/4s (Black) Advance 2200mAh battery charger case for iPhone 4 & 4S Standby Time: Up to 210hrs Audio Playback : Up to 28hrs Talk Time: Up to 8hrs.Weight: 71g Two color to choose:White,Black.