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How does this battery differ from its predecessors?
It is flexible and has a long charging capacity of up to 20 hours.
How much energy does it produce?
For every 2ml of sweat, the battery produces a voltage of 4.2V, which is enough to power a commercially available temperature sensor.
Engineers at Nanyang Technological University in Singapore have developed a flexible battery that charges through sweat and can produce enough power to power a smartwatch for 20 hours.
The device that houses this battery is 0.8 inches, is flat like a bandage, has a stretch fabric that absorbs sweat and can be worn around the wrist or arm, and it can also be attached to portable devices such as connected watches.
Another feature of the fabric is its ability to retain sweat, providing the battery with constant power even when the wearer sweats differently; Because the rate of human skin perspiration varies not only with body location and environmental conditions, but also with the time of day.
Unlike conventional batteries, the new battery does not contain heavy metals or toxic chemicals that can harm health and the environment.
“Our technology heralds a previously unattainable step in the design of wearable devices,” Nanyang University study author and materials scientist Puy Si Li told Science Advance on Monday.
“By taking advantage of a pervasive product in the body, which is sweat, we can envision a more environmentally friendly way to power portable devices that don’t rely on traditional batteries.”
During the experiments, the researchers sprayed the fabric with synthetic human sweat and found that it could generate an electrical voltage of 3.57 volts.
They then tested the device on a real person, who wore the battery around their wrist while cycling for a 30-minute workout.
The volunteer was able to generate a voltage of 4.2 volts, sufficient to power a temperature sensor sold on the market, and continuously send the collected data to a smartphone via a Bluetooth connection.
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