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Originally Posted by BrianG
I too noticed increased runtime with more cells, but that turned out to be simply that you are into the throttle less to achieve the same speed. The max power with a higher voltage setup is higher, so you don't need to push the batts as hard to get the speed you want. There is some savings with higher rpm since there is a little more "resistance" so that helps too.
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You will get better efficiency overall with higher voltages. All losses associated with resistance goes down with the current.
Power loss = Sum[I^2*R(x)],
where R(x) resistance of:
- motor
- wires
- connectors
- FET's
- Cap's
- Batteries
- ...
Going really high in Voltage is not good as well :) There are obvious reasons and electrical.
Artur