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Converters and regulators are going to be very current-limited, much like a BEC (same thing, really) - the ones linked can only do 3-5 amps, an RC car can pull 10x that much. Not to mention the added size and inefficieny, losing 10% or more of your power as heat in the converter.
Sorry, you're absolutely right. I wasn't implying anything just adding to what you said.I never said it was a good idea. I just dont know why a hobbyist would need to do this .when batteries are so cheap these days..