The long and the short of it is, the motor was designed to run on 3, 4, 5, or 6S LiPos only. It will not operate properly on voltages lower than 11.1 (3S LiPo) and you risk damaging the motor if you run it on voltages over 25.2V (6S LiPo).
NiMHs are not designed to handle high amp draws like...
The motor is designed for 3S-6s LiPo voltages which translates to 11.1V-25.2V. A 2S lipo wont be able to power it properly, nor will a NiMH. If you want to attempt using a NiMH just make sure its between 11-25V but it will drain it so fast youll blink and miss it and if you keep doing it you'll...