USB Fever has this iPhone 3G compatible battery pack available for $44. The rated power capacity is 2,400 mAh which is a full 50% larger than competitors such as the Mophie. This slide on battery pack contains a built-in speaker for the phone as well as volume and power buttons. Like the Mophie you cannot synch through the battery pack - you’ll have to remove your iPhone and connect it directly to your computer in order to sync at the end of the day.

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Amid quietly rising complaints of so-so battery performance with the new 3G iPhone comes an announcement to expect the Dexim BluePack - a “bolt under” extended battery solution on August 1. It’s a lithium battery for iPhone 3g with 1,200 mAh capacity. Once charged (via USB) you can expect an additional 36 ours for music, 7 hours for video and 3.5 hours of talk time - all for only $79.72. Read on for another pic and a link to the order page.

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