I have been very lucky with my atty's so far. I've had a 4081 and 4072 (both njoy's) for about six weeks. I have noticed that the vapor production has started to taper off in the last week. I haven't been using them very freqently in the last couple of weeks and wondered if that has something to do with it. I am still using the original 2 batts that came with them and they are starting to give a shorter amount of usage time. So what I was wondering is if I need new atty's or batts. I thought that when an atty went bad it didn't work at all so I'm thinking its the batts. Just wanted to know if anyone has a "bad" atty that just produces less vapor or if an atty isn't "bad" until it stops working 
