@bwh79 mod was
not connected to a charger, it was on my computer table left over night with 80% charged vtc6 cell inside. With morning alarm the terrible smell of hard to explain burned rubber plastic smell awaits me. It took me a few minutes until I discovered what it was.
mod was still warm, if there was smoke it was already gone but the burned smell I can still feel in the flat and it was yesterday morning.
Battery doesn't look damaged, tested it, 60ish % left.
The only strange thing during usage I noticed is a like clock ticking 6,7 seconds quiet sound after releasing the fire button on both my Primos. Besides that I was quite pleased with them.
In any case be aware of this issue.
I did send
joyetech support an email and if they respond I'll let you know peeps.
Stay safe