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Scientists create the watch of the future… it works with human sweat

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Scientists from Singapore have developed a small, flexible battery for low-power wearable devices that are powered by human sweat.

They also confirmed in the study published in the journal “Science Advances” that it only takes 2 milliliters of sweat to discharge 20 hours of electricity.
The device measures just 0.8 inches square and is as flat as a bandage, and was designed by engineers from Nanyang Technological University in Singapore.

The battery is attached to a stretchy, sweat-absorbent fabric that can be worn around the wrist or upper arm, and can also be attached to wearable devices, such as smart watches.

The stretchy fabric is able to retain sweat, providing the battery with a stable supply even when the user sweats differently.

The sweat battery also differs from conventional batteries in that it does not contain heavy metals or toxic chemicals that can harm health and the environment.

The researchers first demonstrated the potential of their new battery by spraying it with synthetic human sweat, only to discover that it could generate an electrical voltage of 3.57 volts.

Next, they tested the battery on a real person who wore it around their wrist while cycling for a 30-minute workout, and it was able to generate a voltage of 4.2 volts and produce a power of 3.9 megawatts, enough to power a commercially sold temperature sensor, or send the collected data continuously to a phone Smart via Bluetooth technology.

For his part, confirmed the study’s author, Pui Si Li, from Nanyang Technological University: “The new technology heralds a previously inaccessible milestone in the design of wearable devices.”

He considered that “sweat is a near-guaranteed source of energy produced by our bodies,” and predicted that the battery would be able to power all kinds of wearable devices.

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