For the iPhone 4 owners, you should now be looking for an external battery case for your iPhone 4, so you can always have backup power to let you finish any urgent conversations or complete watching any interesting video. Freshly arrived at USBFever is an external battery case, called the Mili Power Spring, which is specially designed for the iPhone 4.
The Mili Power Spring battery case measures only 18 mm at its thickest point, which is claimed to be the world’s thinnest by the manufacturer. Such a super thin case will not add any additional thickness to the iPhone 4. So it’ll still slide in your pocket or purse as easy as it does without a case.
The Mili Power Spring case consists of two parts which clip together to protect your iPhone 4. It’s easy to use, just slide the iPhone 4 into the case and put the top part of the case on. This iPhone 4 case is made from a hard shell plastic, features a sleek black paint finish that looks similar to the back of an iPhone 4.
This battery case has a 1600 mAh internal battery which can be recharged via USB port. On the side, there is an on/off button and built-in LED as battery indicator showing the remaining charge. If you want one, you can get it now from USBFever for a price of $150.
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