Basic question on powering a DC motor
Eugene is right, you can't do that. I am both an engineer but started out in RC like you I'm assuming. Yes, the power is being provided by a DC battery but that is an AC motor. The speed controller (ESC) used in RC cars and planes is what converts the battery's DC voltage to AC to control the motor, hence 3 wires (3 phases) to the motor instead of just 2 (+ and -) to a DC motor.