Mophie has released a new juice pack air, built for the iPhone 4. Like other air models the battery case is designed primarily to be thin. It has a soft rubber finish for grip and shock protection, and provides access to top ports, along with a removable bottom section for docking. Its lithium polymer battery is rated at 1500mAh and should offer an additional six hours of 3G talk time, 36 hours of audio playback, or nine hours of video.