No need to lose your shiznit the next time you need a power outlet for a dying cellphone. Scientists at the University of Southampton are working on an energy-harvesting film that could make juicing a gadget as easy as swinging your arm or treading across a rug. Steve Beeby and his team at the university’s School of Electronics and Computer Science are using a combination of rapid printing processes and active-printed inks to screen the film directly onto fabric and textiles, including carpet. Batteries aren’t required, either. Because the film is designed to convert ambient energy in the environment—including motion and heat—into electricity it doesn’t require recharging or replacement.