Fake news: battery producing electricity using beta decay aren't a new technology, are arounds for decades, those devices produce electricity in order of micro ampere/h, 1 / 1'000'000 of ampere, currents, so small can only fit to niche application, like preserve the status of few bytes of RAM. A phone needs million of time that current not only to operate but even to have a
detectable recharge level increase. So article stating they can power or recharge phones and drones are pseudo-science and fake news, I'm reporting this because I observed a proliferation of articles with the same topic, this "50 years miracle battery", without reference, scientific documentation, tests, any paper with scientific value :
https://news.ycombinator.com/item?id=38966352
https://news.ycombinator.com/item?id=38978085
https://news.ycombinator.com/item?id=38970438
https://news.ycombinator.com/item?id=38980963
https://news.ycombinator.com/item?id=38943144
https://news.ycombinator.com/item?id=38951104
maybe they are a scheme to deceive potential investors.