Ego Mega Dual coil from smok Tech, one of my all time favorite carto betrayed me. I have been using this particular carto for a month now and maybe while I was working I might have accidentally pressed the button too long and burnt it out.Ego 1 wont light up so tried Ego 2 and all i got was three flashes and dead. Then stupid me decided to try the same carto on a third ego. three flashes later and I have myself three dead semi new batteries that wont fire at all even with a new carto or atty. Nothing bad to say a bout the Mega carto and i will continue to use them but but a hard lesson learned for me and hopefully prevents it happening to you guys is if a carto is burned out thrash it and dont try it on any other batteries.