I locked the firing button ring down on my Natural and decided too change from a big batt too a smaller one this morning.After unscrewing the mod and screwing it back i twisted the locking ring open and didnt realize it,put the mod im my case and went too lock my door,well,I was waiting for the elevator for less than a minute and took out the mod for a vape and it was super hot,i had too drop it on the floor,im ok and no damage,im damn lucky i pulled it out for a vape,PLEASE make sure your firing buttons are locked,maybe time too get a 2 cent fuse.