LifeCHARGE Approved 2000mAh Rechargeable Extended Battery Case for Apple iPhone 4/4S - Retail Packaging - Black Designed for use with Apple iPhone 4 and 4S for a custom fit and extended battery life. Polycarbonate case with a satin rubber finish offers reliable protection against damage. Built-in 2000 mAh lithium-polymer battery for 8 hours of talk time, 40 hours of audio and 10 hours of video LED indicators keep you informed of the current charge status. USB connectivity allows you to recharge the case while charging your phone.