Typically these batteries work by utilizing the decaying properties of radioactive material. Essentially, it works similarly to a solar cell where the radioactive material functions as the sun by emitting isotopes. The thing is, these batteries start losing power on day one, as the material decays. I don't know the half life but let's assume it's hundreds of years. At any rate, the power steady decreases. Then there's the issue of energy density. They don't output very much current, probably only a few milliamps and also a few millivolts. In order to use these for anything useful, the battery would need to be pretty large. Also, these are not batteries, but nuclear generators.
Back in the 70s, there was a prior attempt at EV's but with Nuclear Batteries/portable nuclear generators. I am trying to remember but I thought they had an atomic train. But already the problem is quite obvious with millions of these on the roads.
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