I have a manual mega 510 battery from madvapes, that I just noticed got very hot, and smoke strted coming out of the end where the LED is. I had just put on a new cartomizer that i also got from madvapes. I don't know whther a cartomizer can kill a battery like this or not, but I have other cartomizers that have worked well from the same batch. I am obviously hesitant to try any others, as i now only have 1 battery that might work. The smoking battery i am assuming shouldn't be used any more.