Mophie has introduced its latest accessory for the iPhone 3G, the Juice Pack 3G battery extender. The device features a lithium polymer battery that is claimed to offer an additional 350 hours of standby time, 6 hours of 3G talk time, 12 hours of 2G talk time, and 6-7 hours of internet use. Rather than drain the internal phone batteries before switching to alternative power, the pack drains the external supply first. The charge status is displayed with four integrated LEDs located on the back panel.

The pack also offers a soft rubberized finish for protection and grip. USB pass-thru allows the phone to be synced or charged while held in the pack. The Juice Pack 3G is now available from Mophie, with a price of $100.