Quartz

June 18, 2016

Imagine charging your FitBit by simply wearing it while you walk.

While wearable devices are growing in popularity, they still share a common burden: The more complex the device, the shorter its battery life. Until perhaps now. In a paper published on Friday (June 17) in Science Advances, researchers outline a way to harvest energy from body movement using nothing more than salt water and a flexible rubber band.

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