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Long sidetrack short.
I misinterpreted the point of post #127, which was clarified in #129, and I agreed with in post #131.
Rather than alluding to personality defects you find unflattering (I'm accepting of my Asperger-isms), can you state what you disagree with in post #140? If you feel that the drive unit itself qualifies as a discrete heater, then I shall agree to disagree. If there is something else I am wrong about, I would like to know that to avoid the same error in the future.
To me the plumbing around the cells is not a "heater", it's a heat transfer mechanism. The heater is the motor/inverter, which does not heat only the cells, so not "discrete".