When I spoke to a regional manage for the west about Supercharging he made it clear this is not the sort of thing you would do a lot. It has a somewhat substantial effect on the battery's lifespan. He mentioned you might do it 3-4 times a year. Anything more and prolonged would definitely affect battery life.
So, he believed that Supercharging would be a per use charge since it's not expected to be something owners do often.
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