We introduced a few nice iPhone 4 cases with backup battery. But if you want an eco-friendly way to charge your iPhone 4, GreenSimian’s SolMate solar powered iPhone 4 battery case should be able to catch your eyes.
SolMate is a unique milled aluminum and silicon-dioxide glass protective case that measures approx 5 x 2.35 x 0.6 inches and weights 2.5 oz, and designed for iPhone 4 and iPhone 4S. In addition to protecting the iPhone 4 or 4S from bumps and scratches, the unique casing is also able to charge the integrated ultra-thin 1600mAh rechargeable battery from any light source or inductive power surface, moreover, using the built-in QI inductive charging chip and free iOS app, the iPhone 4 battery case can effectively charge your iPhone 4 or 4S on the go.
At present, the designer of SolMate solar powered iPhone 4 case is raising fund on Kickstarter. Pledge $99 will let you own a SolMate iPhone 4 battery case. If you’re interested, jump to Kickstarter for more dovetails. Additionally, don’t forget to check other options via “iPhone 4 case” tag.