Yeah, I sent them an email about it, I'm not too worried about it right now, I do have a 6 volt and an EGO to hold me over. I just wanted other ppl to be aware of it because of not knowing about how the circuit is designed, I thought it could lead to a battery failure even without the atty installed. I played with it and got it to turn off but then it stuck on again a few minutes latter and I just took the batteries out and put it away. I really do miss the Joker even though I only got to use it for 6 days, I really think it puts out better vapor than my 6 volt unit. But anyway, it willl be good as new again in a few more weeks. It's just my rotten luck that I have to wait.