I feel in a way, it's a waste to buy batteries that are too big. Because, when you race, they only need to last 5 minutes. Now, you have to charge them. And when you get home and discharge them, they can take almost an hour already for a 3300. It would be nice if they could charge conservatively for 6A but from everything I've read, 4A is the limit right now.
I'm a n00b tho and only completed one raceday.