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This is Scientific American 60-Second Science. I'm Christopher Intagliata. Got a minute?

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More than half of all Americans carry smartphones.

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Smartwatches and smartglasses may not be far behind.

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What's not all that smart are the rigid batteries that power our gadgets.

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But some may soon be replaced by ultra-thin, flexible batteries, sewn right into your clothes.

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Researchers built a prototype out of conductive, nickel-coated polyester fabric.

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They applied lithium compounds to create the anode and cathode, and separated them with a spandex-like material.

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The finished battery was just half a millimeter thick, with a capacity of 510 milliampere-hours per cubic inch, about a quarter that of the battery in an iPhone 5.

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And the tighter the knit, the higher the capacity.

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Of course, fabric wrinkles.

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But this battery can too.

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Even after being folded 5500 times, the battery kept trucking.

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Thin foil batteries, on the other hand, took just 70 folds to become really foiled.

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The findings appear in the journal Nano Letters.

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You don't even have to disrobe to charge this wearable battery.

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Researchers tacked flexible solar cells to it, so it can charge on the go.

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May be just the thing to make polyester current again.

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Thanks for the minute, for Scientific American 60-Second Science. I'm Christopher Intagliata.

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