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In fact, the battri voltage should not make a difference that much.... the capacity of the pack if by far more important when talking about torque....
if the motor needs, let say 3 amps to turn when stall, and you pack is only a 600mA, then it will have a hard time giving enought power to the motor....
what an other proof???
the formula for power is Volts*Amps.... so if you drop the voltage, but rise the amp, then there is no power lost...
simple as 3*2=6 and 3*2=6....
voltage only change speed of the motor, but if you have higher voltage, and the motor is working bad, you will so need less amp to have it turn....
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