I'm seriously looking for a box mod for my fiancee now. She uses a smok NBC, and while it works okay with her eGo batteries, I found that it seems to be wearing out the 510 threads, so I figure it may be best to just set her up with a box. I'm looking for a box that takes batteries (not one with a built-in battery). It can be very low power, in fact I was considering the eleaf istick 10 until I realized it didn't take batteries. I want to use variable wattage mode, and it has to be able to be turned down pretty far (thinking 5w).