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They can be miniaturised, using the photoelectric effect, alphavoltaics or betavoltaics.

We do not use them because "Nuclear is bad, m'kay?", and the market just isn't there, so the R&D hasn't happened.

>We do not use them because "Nuclear is bad, m'kay?"

The irony is nice but misplaced. We already have a huge problem disposing the toxic waste of regular batteries.

Not to mention what other misuses those could have if accessed by the random lunatic....