How much you need mAh for one race?

[brushlessboy16]

that setup would probably use about 350-450mah/min as a rough estimate.

If you can make 45 minutes on one battery then good for you, but the extra weight will cause the motor to run hotter, bringing your runtime even lower.

5000mah packs seem to be a good balance between run time and weight.

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45 minute mains you would probably need 3 battery swaps