PowerSkin (http://www.Power-Skin.com) has released a protective smartphone cases with built-in batteries for the iPhone 4 (with a universal fit for the AT&T and Verizon versions), equipped with 2000 mAh of battery-boosting power and the option to sync to iTunes.
The US$79.99 PowerSkin case is outfitted with impact-resistant silicone rubber and patented XPAL powered battery technology that purportedly provides phone life up to eight hours for the iPhone 4. It’s made of a 100% recycled case (except for the battery and internal components). The PowerSkin case sports a micro USB recharge port, LED battery status lights that indicate exactly how much power remains and an on/off button.
