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  • A $2.50 sleeve can make batteries last 8x longer

    June 02, 2015 1 min read


    We love a good development in battery technology, but most of the ones we’ve read about in the past few years still aren’t close to being used in a real product. Today’s invention […]

    The post A $2.50 sleeve can make batteries last 8x longer appeared first on Geek.com.