As speculated last week, Mophie has released a Juice Pack Air case that doubles as an auxiliary battery for the iPhone 4. The seventh in the line, the pack is made of soft-touch plastic and can nearly double the battery life of the iPhone 4. The pack is said to provide up to six hours of extra talk time on 3G networks and up to 12 hours on 2G, with up to 36 hours of added music or nine hours of video.
