Self-charging battery generates electricity from moisture in the air - ABC News

New "self-charging batteries" can harvest enough energy from moisture to power small electronic devices. They sound too good to be true — so, how do they work?

Fitness trackers powered by sweat. Bluetooth earphones than run on atmospheric humidity. Stick-on insulin sensors fuelled by thin air.  These are some of the potential applications of what have been… [+6382 chars]

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