I know a .1 build is like 42 amps CDR, but if I get a 40 amp battery, because it's only being pulsed for 2-3 seconds it wont be as bad will itIt will. And it will tear your battery's to bits. Even builds with a 21700 of .1 and lower will gut you batteries performance and longevity. Not to mention how close you may get to thermal runaway.