Double your iPhone battery lifePerhaps one of the best $100 you could spend on any iPhone accessory – the Mophie Juice Pack Air gets 2x the battery life and a durable case all in one.

There are lots of clunky “battery” extenders for iPhones, but none as integrated and as elegant as the Mophie Juice Pack Air. It fits the iPhone 3GS like a glove, truly doubles the battery life and is durable as can be – I’ve dropped it a few times with only a scratch or two. And it’s the only battery that Apple has certified for use with the iPhone 3GS.

Now of course, all this goodness is not without at least one drawback. And for some this is trading one of the iPhone’s biggest pitfalls for another: the Juice Pack Air does slightly impede iPhone reception.

While most users testify there is a loss in signal strength, the ATT network is so poor anyway, its really hard to tell just how big of an impact the Juice Pack is having.

All in all, the slight loss of signal is outweighed by the case protection and extended battery life.

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