The Mojo Removable Battery Case for iPhone 4 ($100) is the first finished product we've seen from Ibattz, and it seems that the company is on to something. While the case looks like a few of the others we've seen in the recent past, it includes a valuable bonus feature: not only is the 1500mAh battery replaceable, but a second battery is included in the package. Though Ibattz claims the set triples the iPhone 4's battery life, our testing of other…
