Well luckily when I bought my Zmax from madvapes it came with a 90 day warranty.Today with no warning it went from vaping fine to smoke poring out the top and a bad electrical burning smell.I unscrewed it real quick and removed the battery and after a few seconds it stopped smoking.The battery was cool so I guess the electronics just went up in it.Put a ticket in with madvapes so we will see how it goes.See ya.