I do not practice it myself, but I know the big thing in stock racing evidently is to charge the batteries at 40 amps or so. From what I've kind of picked out of the different threads on it, it's not necessarily about putting more power into the battery, it's about building heat. something about the higher temperature makes for a lower internal resistance and more power I guess. my question is, what kind of actual temperatures are they trying to reach? And instead of overcharging them to build heat, why could you not use a charging bag sitting on top of a heat pad? I do a stock in all three classes, and while I am just as much about getting more power as the next guy, I am in no hurry to overcharge the hell out of my battery.
Nick