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Re:Makita has made a sturdy coffee machine aimed at construc... by imglorp on Sunday May 27, 2018 @06:34AM (#17166334)
640ml * (82c - 20c) = 39,680 calories

18v * 6Ah / (4.2 j/cal) ~~ 92,571 calories/battery if 100pct efficient heating

So, about 2 pots per battery.

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