updated 05:00 pm EDT, Tue June 14, 2011
Adds six extra hours of 3G talk time
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.
A toggle switch turns the battery on and off, and an LED readout shows how much power is left. The case comes with a passthrough USB cable, which can be used for both charging and iTunes sync. To improve sound quality the case redirects audio from the bottom of an iPhone to the face.
The iPhone 4 version of the juice pack air is currently available in red, black and white. Both GSM and CDMA button layouts are supported. It costs $80, and can be bought online or at retail Apple Stores.