Story Brief

PHoto-Illustration: Jobanny Cabrera; Getty Images Comment Loader Save Story Save this story Comment Loader Save Story Save this story You’re walking the dog at night, and your little flashlight, which has been getting dimmer, conks out. Instead of stumbling home in the dark, wouldn't it be great if you could somehow eke a little more energy out of the batteries inside? That's not as crazy as it sounds. When a battery-powered device stops working, we say the battery is “dead”—but it's not really.

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