Our mobile devices are power-hungry — there's a reason battery packs are popular, after all. But for many of us, they're just another thing to charge. Powrtabs are one-time boosts of power for your iPhone or Android that can help you out in a pinch, no preemptive charging required. Each one gives you up to four extra hours of battery life, has a shelf life of five years, and comes in a biodegradable shell, which lets you rest a little easier when you throw it in the bin.

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