Nanda Invents Retractable Batteries for Wearable Devices

Researchers at Nanyang Technological University have invented a sweat-driven and retractable battery suitable for wearable technology devices.

This battery is only 2×2 cm in size, which is as thin as a piece of paper bandage. Researchers attach the battery to a stretchable, sweat-absorbing cloth, and then connect it to a wearable device, such as a watch, wristband, or armband.

According to the test, the tester put the battery on his wrist and exercised on a stationary bicycle for half an hour. The results showed that the battery can generate 4.2 volts and 3.9 milliwatts of output power during the whole process, which is enough to drive commercial body temperature detection. Sensing the device and transmitting the data to the smart phone via Bluetooth.

Li Peishi, a professor at the School of Materials Science and Engineering at NTU, said that this battery does not contain heavy metals or toxic chemicals, so it is more sustainable than ordinary batteries.

Li Peishi also said: “We use human sweat to operate this battery, so organic electrolytes are not used, which are generally flammable. Our electrodes do not use any toxic metal elements. We use sweat to make electrolytes. On the one hand, Protecting the environment, and then speaking, can also increase user comfort.”

NTUitive, a creative and corporate company affiliated to Nantah University, has applied for a patent for this invention.