Well, It appears that it is just dead. There was no juice in it at all. No power registering at all when I hit the button or not. Using a volt meter, I tested the other batteries and at full charge, they were 3.85. This battery which was working fine just a few seconds before hand, is not registering any power even though the light is on. I noticed that the vapor production had come down so I was getting ready to charge it. The light came on shortly after I pulled the atomizer off and hasn't cut off since. Doesnt appear that the button is stuck or anything, it clicks every time you click it. I tried tapping it on the edge of the desk, nothing. the blue led just stays on. I would hate to contact the seller again, I had a cartomizer that was doa in my package and he sent me out another one. I got a couple more batteries coming so I should be ok.