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Re:'Freeze-thaw battery' stores electricity long-term for se... by arcticbull on Tuesday April 05, 2022 @09:31PM (#30927386)
There is the Seebeck effect, where you run a Peltier junction in reverse. Efficiency is, to put it mildly, low. [1]

[1] https://en.wikipedia.org/wiki/Thermoelectric_generator

Re:'Freeze-thaw battery' stores electricity long-term for se... by vikingerik on Tuesday April 05, 2022 @11:30PM (#30928180)
This still works from a temperature differential, not just a quantity of heat.