You can dry burn on a vv ego, also depends on what atty your using. With the ce4's, vivis etc I used to remove the head and soak in boiling water then get most of the moisture out with kitchen towel before dry burning. But since I have learned, you can torch silica to dry it out, then you don't have to use the battery so much before it glows. I usually hold the button in for about 5 seconds.