The power of the Apple iPhone 3G is almost a double-edged sword, because you are motivated to keep using it. Surfing the web, using the apps, playing the games… these all take up a good deal of power and the battery life on the iPhone 3G isn’t exactly up to the task. In fact, the lack of battery life is one of the most common complaints about the iPhone 3G.

While you could bring your wall charger with you everywhere you go, it’s probably more practical to invest in something like the Mophie Juice Pack. In a nutshell, this wonderful little accessory acts as a second battery for the iPhone, providing it with more juice for your mobile lifestyle. The Juice Pack has enough power for 350 hours of standby, 6 hours of 3G talk time, 12 hours of 2G talk time, 6 hours of 3G Internet, 8 hours of video playback, or 28 hours of audio playback.

The Mophie Juice Pack retails for $99.