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I'm not sure the comment about the drop in voltage due to the lower C is entirely correct.  The voltage should remain around 11.1v unless the current draw from the motor exceeds the capability of the battery, at that point I would expect to see some sag in the voltage and RPM until the trigger...

Hmm Once I found out how to calculate the discarge from the battery, ohm's law led me to this... For the 7.4v 30C battery, we can say for a 1000mAh capacity (for ease of calculation) the battery is capable of discharging 30amps.  The power to the motor would be 222 watts (watts as a unit...

Disclaimer: The 'C' values stated in this post are simply hypothetical in an attemp to explain the thinking behind the question. If you increase your voltage from 7.4v to 11.1v, your ROF increases.  If you change your battery's C rating from say 15C to 30C, your ROF could also increase by some...