Very interesting Setup from Mega Motors

[coolhandcountry]

By dropping the gearing down on motor. You change the torque load on
motor and also changes the amp draw. Also with more voltage on a motor
you don't have to run as hard so the amp draw is not as bad. If the truck
will flip over at 750watts. The higher voltage will make the truck flip with less
throttle input.

When you got to 5s you stated you changed the gearing.
You are adding more current avilible with another cells as well.
If some one has an eagle tree. It would show up better.