I got my first protank yesterday after reading all of the positive reviews. I filled it and put it on my vamo v2. Nothing happened. I switched to a fully charged batty. Nothing. I figured it was a dud head. Changed heads. Finally! I gaped for about 1/2 hr and every few hits tasted burnt. Then.... Nothing!?!?!? WTH? Why won't it work? I finally got frustrated enough to go back to my vivi nova. Perfect! What am I doing wrong?