Below are three articles published in 2024 about companies developing radioisotope batteries. These are probably not ever going to power a Tesla automobile, but there are applications that could use these batteries for 50 or 100 or 1000 years without needing a recharge.
From China…
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California based Infinity Power…
From the article:
The battery, developed with support from the US Department of Defense, has demonstrated an overall efficiency of more than 60%.
“Compared to other radioisotope energy conversion methods with low efficiency (less than 10%), it marks the highest level of overall efficiency ever achieved,” the company claimed. “This shows that the upcoming commercial release of next-generation radioisotope power sources holds out huge hope.”
Nuclear batteries utilise the energy released by the decay of nuclear isotopes, converting it into electrical energy through semiconductor converters. Infinity Power says its battery uses novel electro-chemical energy conversion and “can provide tens of milliwatts of power for over 100 years”.
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From the UK…
The battery is based on the radioactive isotope carbon-14. It uses its radioactive decay - it has a half-life of 5,700 years - to generate low levels of power.
_ Pete