THIS! As someone who vented a few batteries back in the days when I first started vaping ecigs I know first hand what heat can do to these battery cells. Even the best cells like Sony and Samsung. Heat makes these things vent. The other night after running a session back to back and then turning it on again just to go nuts. Pulled the battery out and hit it with the thermo-gun. Battery was sitting at 190 F. Granted I ran the device for like 22 straight minutes to get there but still, 190f is way higher than the threshold of the batteries. I believe it was luck that it didn't vent right there on my table. o far nothing like that has happened even with 2 sessions back to back BUT the potential is there. Must be a better way of housing that battery to reduce thermal conductivity.