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(2024) Discussion at the time (17 points, 13 comments) https://news.ycombinator.com/item?id=42323979
Cherrypicked parial comment:

> Reality check, because everyone always gets excited about this: the power density of these devices is on the order of 10 µW/cm^3 - about eight orders of magnitude lower than a lithium-ion battery. Technical advances may improve that somewhat, but it will never be competitive with conventional power sources.