Researchers create battery-free mobile phone

Researchers at the University of Washington have created a mobile phoneprototype that doesn’t require a battery to operate.

The astonishingly efficient prototype requires just 3.5 microwatts of juice, and it employs an innovative approach to avoid the need for a battery cell.

Instead, it uses ambient power from radio signals and light — its onboard solar cell is “roughly the size of a grain of rice” — to transmit a signal back to a base station 50 feet away.

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The prototype itself is made of simple materials: capacitive touch buttons, a circuit board, and other “off the shelf” components.

More impressive is that the team of scientists were able to create a custom base station to transmit the signal with such a small amount of power.

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