Extended Rechargeable Battery Case for iPhone 4 (B

Extended Rechargeable Battery Case for iPhone 4 (Black) With this large capacity (1700 mAh) Rechargeable Power Case for iPhone, you can enjoy your movies, music, phone calls and internet surfing without worrying about the battery running out! This portable charger can recharge your iPhone to 100% one and half times when it is fully charged!Extended Battery: Doubles battery life of iPhone 4 provides up to 5 additional hours of talk time and 28 additional hours of music playback time Charge your iPhone 4 Rechargeable Battery Case with the included USB cable, and without removing it from the Power Pack Smart battery technology drains battery of the Power Pack first before switching toyour iPhone's battery Rechargeable: Convenient rechargeable battery allowing you to always have a battery charging backup when you are away from a AC outlet Battery Capacity: 1700 mAh Standby time: 210 Hours Talk time: 5 hours Internet use: 4.5 hours Audio play: 28 hours Video play: 7 hoursCompatible with Apple iPhone 4