Keep one in your purse, briefcase, backpack, or pocket, and it'll gather and store energy while you walk, jog, exercise, drive, dance, climb mountains, or even play video games. The nPower PEG is designed to recharge just by your moving around, such as by walking, running or cycling. Again, however, this one appears to be a design idea, rather than an actual product. Shaped like the grip of a golf club, it generates electricity while you practice your swing. Then there's the golf club hand grip charger. This device provides a full charge after 90 minutes of pedaling, although it does not appear to be available for purchase. Some of them are also a lot of fun, like the Watts Maker, which charges your phone while you're riding a bike. Other kinetic chargers generate greater amounts of power. Around 130 rotations will give you about three minutes to talk or fire off a few texts. To charge one, you pop the battery out of the phone, stick your finger through the hole, and spin it around.
These batteries have a finger-sized hole near the top. Although kinetic batteries don't really provide a reliable, long-term charge, they're great for quick power-ups when you just need a few minutes of talk time.
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