If you are an iPhone user like me you are using your iPhone a lot, whether it is to make calls, surf the internet, or play games. All of this usage on the device really takes its tool on the battery life. I know after using the GPS and 3G on my iPhone my battery dies pretty quickly. I'm sure many people have the same problem so is why Mophie has come up with the Juice Pack series of rechargeable portable batteries for the iPhone. Today we are looking at their 3rd revision, the Juice Pack Air.