Here’s an interesting cautionary tale on radioisotopes. The goiania incident: https://en.m.wikipedia.org/wiki/Goi%C3%A2nia_accident https://en.m.wikipedia.org/w

Here’s an interesting cautionary tale on radioisotopes. The goiania incident: https://en.m.wikipedia.org/wiki/Goi%C3%A2nia_accident https://en.m.wikipedia.org/wiki/Goi%C3%A2nia_accident Not saying the batteries would be this bad, but having widespread sources of radiation in the hands of people who know nothing is a bad idea. Even relatively benign ones like Ni-63 can go sideways if someone ingests it. These batteries seem to be intended only for very specialized niche applications, which is as it should be.