2S vs 3S run times?

[Finnster]

One other consideration is that running a cheap motor on partial throttle kills the efficiency. You may not gain much runtime as you are just burning it up as heat. Misgearing a cheap motor is also bad.

Don't be stuck on the same motor. Pick what voltage you want to run on (2s or 3S) and then match the motor to the battery. Ie if you want have 2S/3500kv combo (24500rpms) then a 3S batt w/ a 2300kv motor would be about the same spd, but will run cooler and longer due to higher efficiency.