The California-based startup NDB has unveiled a battery that uses nuclear waste and lasts up to 28,000 years.
The power of the nano-diamond battery comes from radioactive isotopes used in nuclear reactors.
Its radioactive core is protected by multiple layers of synthetic diamonds, one of the hardest materials to damage or break.
The energy is absorbed in the diamond through inelastic scattering, which is used to generate electricity.
The battery can be used to power devices and machines of any size, from aircraft and rockets to electric vehicles and smartphones.