Es handelt sich auch nicht um einen Akku wie der Artikel-Titel behauptet. (Definition: elektrisch auf/entladbar)

In der Videobeschreibung wird es als Batterie bezeichnet:

Scientists and engineers from the UK Atomic Energy Authority (UKAEA) and the University of Bristol have successfully created the world’s first carbon-14 diamond battery. This new type of battery has the potential to power devices for thousands of years, making it an incredibly long-lasting energy source. The battery leverages the radioactive isotope, carbon-14, known for its use in radiocarbon dating, to produce a diamond battery.

https://www.youtube.com/watch?v=IgGVt4sUnnw