We have featured many usefuls with backup batteries, but if you want more options, let’s go on checking iKit Nu .
This is a form-fitcase that measures 60 x 124 x 14mm and weights 2 ounces. The entire protective case features elegant slim design, while its solid construction can protect the iPhone 4 from bumps and scratches, and the smooth rubber finish offers you a comfortable and secure grip. Inside, the iPhone 4 case also features a built-in with 1400mAh capacity in order to extend the battery life of your iPhone. The external blue LED indicator shows you the status of the backup battery. Apart from that, the battery case also comes with an integrated iPhone 4 stand to hold your device in landscape viewing mode.
iKit Nu iPhone 4 battery case is priced at $64.95 USD. If you’re interested, jump to iKit official site for full details. Additionally, if you need more options, you might like to check Sol Solar iPhone 4 case, Third Rail iPhone 4 case and more via “iPhone 4 case” tag.