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Nokia, the world’s largest mobile phone manufacturer, has filed a U.S. patent application for a gadget that uses body movement to charge the battery in devices such as mobile phones. Nokia’s invention makes use of piezoelectric elements, which absorb energy as the device is moving around in a pocket or purse, and transforms it into electricity, the company said in an application filed to the U.S. Patent and Trademark Office.
As electronic devices add ever more complex features they also require more energy, so extending the battery life is getting increasingly difficult, Nokia said in the patent application.