It doesn’t have charming slim design and vibrant color, but if you like eco-friendly charging solution and large battery capacity, Sol’s iPhone 4 battery case with solar panel should be suitable for you.
As we can see from the images, the iPhone 4 case features a wide solar panel on the back in order to convert the energy of sunlight and indoor lighting into electric energy and store in the built-in 2400mAh rechargeable back up battery for extending the battery life of your iPhone 4, while the built-in 30-pin connector allows you to charge and sync your device without removing the battery case.
The iPhone 4 case measures 113 x 66 x 21mm, weights 66.5g, and the durable, lightweight hardshell construction can effectively protect the iPhone 4 from bumps and scratches, and the ergonomic design with slip free coating offers you a comfortable grip. Apart from that, the iPhone 4 case ships with three screen protectors.
Sol solar iPhone 4 charging case is priced at $89.95 USD, and Sol also offers another model for iPhone and iPod touch. If you’re interested, jump to Sol official site for full details. Additionally, if you need more options, you might like to check Thanko’s iPhone 4 leather battery case and Etón’s iPhone 4 battery case.