I like between 6v to 8.4v (with to fresh 3.7v batters, it actually drops to 7.4v pretty quick.) with a 4.5 ohm to 5.0 ohm atomizer. I also like 5v to 6v with a 3.0 ohm atty. I never was much of high voltage vapor, but with my Megaladon I'm loving high voltage.