NOW all you have to do to charge your phone is pop it in your pocket and dance.
Vodafone in the UK has unveiled shorts and sleeping bags that use special circuits to convert body heat or movement to power.
The phone company was testing out the new tech at the Isle of Wight festival last week.
The thermoelectric material was developed with scientists at the University of Southampton, where Professor Stephen Beeby said they had been working on energy harvesting since the late 1990s — and he says this could be the future of clothing.
“There’s lots of research still needed around making this technology hard-wearing,” he said. “There are researchers around the world doing similar things right now, though, and I imagine that this technology will be implemented routinely into clothing and things like that over the next 10 years.”
Eight hours in the sleeping bag would charge the phone to about 24 minutes of talk time and 11 hours of standby time, and a full day of walking and dancing in the shorts pocket would charge a smartphone for four hours.