Originally Posted by tony gray

[The whole contention that a higher C rating gives you more punch is complete rubbish. Yes, in a faster car with a lower turn motor it MAY make a difference, but in a control motor class such as Mini it makes no difference at all. There is simply no evidence to support it. At no stage does the amp draw even come close to the continuous rating of the lowest C rated battery (20C), so having a higher one will make no difference at all.