Phones that never need to be charged? These nano diamond batteries could last thousands of years:

In 2020, a California-based company, NDB, developed a revolutionary battery that could last up to 28,000 years by converting nuclear waste into energy. 

These nano-diamond batteries are made by converting radioactive carbon-14 from nuclear reactor parts into energy-producing diamonds. To ensure safety, the carbon-14 diamonds are encased in a second protective diamond layer, making the batteries not only powerful but also secure.

These self-powered batteries, which generate their own charge rather than storing energy, could be a game-changer for everything from electric vehicles to personal devices. 

Today, NDB claims that their batteries emit less radiation than the human body, making them safe for everyday use — perhaps even as smartphone batteries.