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AFAIK atomic batteries could become a single unit nuclear reactor, but what it is smallest feasible configuration by our current knowledge? (even at conceptual design level)

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  • $\begingroup$ Way too broad. But, as a total spitball, the size is limited first by the density of potential energy - i.e. what isotope in what form, then by how to interact with the released energy, then by how to make that released energy useful. You could make a very small beta-battery - you just might not get much power out of it. $\endgroup$ – Jon Custer May 4 '18 at 13:33
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Reality check: 2 meter height for 1kWh. https://en.wikipedia.org/wiki/Kilopower

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