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Originally Posted by Patrick
...Yeah, I think I remember reading it was 1/4 the power now that you mention it, but I don't really understand how that works, if you half the current and get a quarter of the power where does the other quarter go? Or do you mean half the current though each motor and a quarter of the current all up?
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Well, it's because you are changing the motors from parallel to series. The resistance is changing by a factor of 4.
So, just to make up some easy numbers, let's say each motor has 10 ohms. In parallel, that's 5 ohms. With 20v (again, some easy arbitrary number), that's 4A for 80W.
Now, put those motors in series instead and you have 20 ohms. That's only 1A and 20W.