well they won't perform ideally. what you will still see more power out of 2 amps verse 1 powered correctly. I know a few featherweight they have 1 or are looking to win the title this year. they are all attempting to run over 10,000 watts. it can be very hard on the equipment. but I have seen some of them running their voltage as low as 9 and a half volts. it's all about staying within the limits of the rules and trying to push for every single water power you can get. I personally will be running light weight and middleweight. in light weight I'm limited to 5 batteries. and I'm trying to push 20,000 watts out that. but I know a few people that are trying to push 30 + from 5 batteries