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Gizmodo by Leslie Horn on 7/18/12
There's the moment when your phone goes below 20 percent power and you get that foreboding notification—if you don't plug in soon, you're going to die. In some situations, even careful planning can't guarantee a recharge. That's why there are portable power packs—when the power is out, or your travels take you far from an outlet, these are the gadgets that hold a charge for other gadgets. Do these little juice boxes work?
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