The capacity and the discharge rating depend on the voltage! I'm looking at running a 2500mAh 45C pack. It is 22.2V. I am also looking at running a 3500mAh 45C pack which is 14.8V. Both should give me about the same run time, and as I'm matching the kV of the motor and gearing to the voltage, they'll both do the same top speed.
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