A team of electrical engineers at Illinois University in the US believe their method will enable mobiles and laptops to run for up to 100 times longer between charges.
It focuses on changing the way a device's digital memory works, as this consumes much of the charge.
At the moment mobile phone memories contain thin metal wires. Every time information is accessed, electricity is passed through them to retrieve the data.
The electrical engineers thought that if the size of the components used to store and retrieve the information could be reduced, so could the amount of electricity.
They have discovered a way of using carbon nanotubes - tiny tubes 10,000 times thinner than a human hair - instead.