I tried to do a search for this before posting but found nothing to give me an answer. When my MVP2 or spinner is charging I use my simple Kanger Evod 1000 (might be 1100MaH I forget) MaH battery as back up. I have no problem with any of my clearomizers other then my kanger protank mini 3. I have three of them that I use for smaller amounts of juice, tasting or when I want something small and discreet. The situation (if it is one) is that within a few moments my battery and bottom of tank is hot (warm to hot). I am using bought coils and they test at 1.5 ohms (as purchased) on my MVPs. I don't know what is up and if it is safe. I understand I am using regulated devices but it still scares me. I am not chain vaping either. This happens after a couple or three toots. All my equipment is under three months and I maintain connections, and coils often. Is this just an indicator that the coil needs to be changed rather then cleaned? Is it dangerous even on a regulated mod?