It's a bit of both, some of them run 2 turn motors that would probably only run for under a minute then would need to be rebuilt or replaced. The batteries wouldn't be any better than what we run, I think it's more to do with the number of cells(some of them run 24 cells) which would have a great affect on the speed generated. I don't know that much about drag cars so I could be wrong.
Sunshine Coast QLD AUSTRALIA
"If you stand still long enough you'll go backwards"