[Rtsbasic]

With an 8s you might destroy the motor if you put them in series (so total 12 cells 14.4v. You could run them in parallel and get a lot more runtime/more torque bceause more amps..but in series the motor will (with no load) come to about 63K. With a load your still looking at over 50k which while insanely powerful could destroy the motor. Mike would be best to say on that (if you brought it from him then you'll know where you stand with warranty if you put 12 cells on).