Don't know if this will help anyone or not, but I kept getting new batteries for my 901. The new batteries would work great for a week, then they would do that thing where they light up, but do not produce vapor. Well, after cleaning the contacts with cloth, and trying alcohol and just about everything else, I decided to take a closer look. After taking apart one of my batteries. I noticed that the inside contact was isolated from the outside contact by a small silicon ring. Basicly this ring holds the center contact in place by friction. It turns out that the charger was pushing the center contact back just enough for it to not make contact with the atomizer.
All I had to do was slip a paper clip gently into the hole on the battery contact, and wiggle it back and forth a bit. This instantly cleared up the problem on all of my batteries.
Just thought I'd post it in case it helps anyone else... I was searching through the forum like mad for a solution and never found one. Not that one wasn't posted, but I never found one.
For anyone who has the light but no vapor, this is your issue. No need to return you batteries.
Good information here. Just don't want too many people to skim past it.
Thanks again er,,,Krotch for this useful information.
