Thanks, the sb is straight forward...just a tube and an 18650 battery, if that is ok? I would hate to ruin a pv because I am not using the right cartos. I use the boge 510 2 ohms with the k-go and the sb at 3.7 and I use the dc 2.5 ohms with the sb at 6v...now, I am using the dc 1.25 with the sb...