I would not worry about how many amps the rs handles. Batteries only supply the power needed for a given setup. The larger c batteries hold voltage better than the lower c so it give you more punch. The more amps you draw cause the voltage to drop faster. that is why a 13.5 motor seem to have more punch and maintain it for a longer time than a 6.5 which draws more current. Batteries only supply the power that is needed.