Charge Your Smartphone While You Walk Mechanical engineers are working on reducing the reliance on batteries no matter where we are. You could plug your smartphone's battery into your shoe when you're on the go. Energy-harvesting technology captures the energy of human and machines motion to power mobile electronic devices. The technology captures energy produced by a footwear-embedded energy harvester and stores it for later use. Power-generating shoes is useful for the military, instead of carrying heavy batteries to power their radios, GPS units and night-vision googles in the filed. The technology is also useful for people in remote areas and developing countries. Human walking carries a lot of energy and it was estimated that they can produce up to 10 watts per shoe. It was said that 10 watts could charge smartphones, tablets and laptop computers. A typical smartphone requires less than two watts.