Originally Posted by Davidka
Is there some reason that this rule can't be applied to Nimh too?
Well, I guess the battery would only be like 50% charged if you did that with NiMH. The rule makes sense with LiPo, because due to their chemistry, going over 4.2V/cell is dangerous, and can lead to a battery fire. NiMH is a different animal entirely.
The voltage limitation on LiPo isn't arbitrary, it's a function of the battery's design and chemistry. ROAR's rule wasn't to limit voltage, it was to prevent then intentional, dangerous abuse of the batteries. The temptation is there because you can get more voltage from the cells by overcharging them, and racers will always try to squeeze more from their gear. In this case, however, there's a very real danger in doing so, which is why people are so upset at the nonchalant attitude toward the practice shown by individuals in the industry.