We've all been there, out with your mates when you need to make a call and your mobile phone battery dies.
Well scientists at the University of South Carolina have come up with an amazing solution - turn T-shirts into chargers!
They found that by soaking them chemicals and then drying them out in special conditions the fabric fibres could store electricity.
It could lead the way for clothes that can charge phones and other devices.
Experts predict that new technologies including roll-up smart phones and laptops will be on the market soon.
Professor Li who lead the experiment said "We wear fabric every day. One day our cotton T-shirts could have more functions"
"For example, a flexible energy storage device that could charge your cell phone or your iPad."