Here is a battery expansion from Case-Mate for your iPhone 3G that also functions as a protective case. The iPhone 3G FUEL Rechargeable Battery Pack provides you with an extra 7-hours for web-browsing, 24-hours of music playback, 8-hours of video playback and 250-hours of standby time. You can get this iPhone battery expansion for $79.99. [iPhoneBuzz]
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