Researchers develop battery-free cell phone that uses almost no power

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Wireless technology now allows electric vehicles to charge as they travel and smartphones to recharge using their screens as solar panels. Now, researchers at the University of Washington have eliminated not just the phone charger and cord, but the entire battery. The team has developed the first battery-free cell phone, using only a few micro-watts of power, which it harvests from either ambient radio signals or light. The prototype phone reduces the amount of electricity needed to operate to a bare minimum by eliminating the step that takes up the most energy – converting analog signals into digital data. Instead,…

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