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Charging your devices on the go is typically limited to the juice available in your portable battery. If you happen to live an active lifestyle, however, then Ampy ($95+) can effectively keep your phone and your backup battery fully charged. Ampy is its own portable 1,000 mAh battery that captures and stores the kinetic energy you generate from biking, running, hiking, and other physical activities until its needed to recharge your USB device. It can effectively store nearly a week’s worth of physical activity for several months and is also compatible with traditional wall outlets.

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