Never over charged. Only had for a couple of weeks maybe. It was sitting in front of us after not being used for a while and it just started going off like crazy. It blinked like normal when i tried to turn it off because i assumed the button got pressed and stuck but this was not the case. It just kept fuming and i mean way more than normal. I had to disassemble it and burned myself. Coil was completely blackened. I resembled it, put more juice in, made sure there was nothing unusual or liquid anywhere, made sure it was OFF, and 10 minutes later there it went again. It had the mesh .15 coil in it but i don't see how that would do it. This is a warning and i couldn't find much on a search except Smok is just crappy. Somehow it bypassed the five click on off safety, and the eight second cutoff