Mophie has announced that the Mophie Juice Pack 3G is now shipping. The Juice Pack holds an extended lithium polymer battery within its sled design. It offers an additional 350 hours of standby time, 6 hours of talk time on 3G, 12 hours of talk time on 2G, 6 hours of Internet use on 3G, 8 hours of video playback, or 28 hours of audio playback. That's an incredible boost to your iPhone's battery.

You'll have to insert your iPhone into the sled which adds some bulk to your phone, but those with intensive battery needs will be happy.

The Mophie Juice Pack for iPhone 3G is available now and sells for $100.