the minimum for a 30A continuous is 30A. but you should give some headway like 10A differential. If it is a sony they have 60A pulse and 30A continuous. But if your calculations are off your battery could vent and other things that you don't want it to do. do you know the continuous for the vapeempire? either way as long as it is 10 or even 8A you are safe with that build.