The Keystone AmigoCase marries up a lightweight 500mAh battery with a swivelized, clip-on, polycarbonate case. Additionally, the kit includes a smudge-proof cover for your iPhone 4, and a USB cable for recharging. Since I don't have the latest iPhone to test with (I'm the iPod guy here at iPhoneLife), I was able to get the case to work with my iPod touch 4G instead--not designed for iPod touch, so do not buy this case to protect and carry an iPod touch!!
