Mini-Generator Could Power Smartphones for Days

The frustratingly short battery life of smartphones and laptops could soon give way to new, button-size generators capable of powering our electronics for days. The MIT-made devices use the same butane fuel found in cigarette lighters, but convert the fuel’s heat into precisely tuned light waves so that solar cells can generate electricity with maximum efficiency.

Each generator has a fuel-to-electricity conversion efficiency three times greater than a lithium-ion battery of similar size and weight found in today’s gadgets.

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