mophie juice pack Plus for iPhone 4/4S (2,100mAh) - Grey Rechargeable 2000mAh battery extender and protective case in one More than doubles the battery life of the iPhone - Up to an additional 8 hrs on 3G and 16 hrs on 2G of Talk Time. Up to 7 hrs of additional internet usage. Up to 44 hours of additional audio playback. Up to 11 additional hrs of video playback. Soft touch finish - Protective form fitting design and shock resistant band. Quick recharging speed. Completely recharge iPhone in 1 1/2 hours. 4 LED Light Status Indicator - Tells you how much "juice" you have left in the case for charging.