The amount of current rated in C from a bettery is the maximum limits it can supply without damaging itself. A 20C 5000mah can supply up to 100A max but remember that if you constantly pull 100A then the life span of the battery will be reduced. A 25C 5000mah can supply a maximum of 125A so if you continuously pull 100A you will not be at the batteries maximum limit so the battery will probably run cooler and have a longer charge/discharge life. It would be good if you could run a Watts up meter on the car whilst running to see how many amps you are pulling. Remember the same rules apply to the Speed Controller as it can supply 100A max if the motor demands. If the motor demands less than the max then the speedo will be efficient and run cooler. I doubt that your speedo will be running at that rate constantly.
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