Nuclear battery produces power for 50 years without needing to charge

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.

More context about the technology at https://en.wikipedia.org/wiki/Betavoltaic_device which mentions "Betavoltaic nuclear batteries can be purchased commercially. Available devices include a 100 μW tritium-powered device weighing 20 grams[12]" linking to a press release at https://newatlas.com/city-labs-nanotritium-betavoltaic-batte... about a product from https://citylabs.net/ .

That's only 20 years, vs. the 50 from this article.

What isotope(s) are they using for 50 years? All I see is "After the decay period, the 63 isotopes turn into a stable isotope of copper", which sounds very odd. Why 63 different isotopes? What decay chain ends up with copper?

Sound like a dumb journo wrote this.

Is the battery a primary cell? Or it is a secondary cell?

One is a producer of energy and usually can't be recharged.

The other is merely a storage for energy and needs to be charged and recharged to be useful.

100 microwatts over 50 years. At $.10/kWh, that's less than half a penny worth of electricity.

those batteries have not produced 50 years of energy. they claim to but we have not yet seen if indeed they can last 50 years (hint : very, very probably not). and you will only reach those 50 years with very, very low power use..