Actually, it doesn't matter what your vaping style is, all batteries and chargers have the potential to fail.
Which is why every vaper using that stuff should have a Class D fire extinguisher in their home !
I had my friend who is fire chief here come over and give me some "pointers" on my property and home.
This is not the same Class A fire extinguisher you already (hopefully) have that puts out general fires.....this one is for metal fires.
If you use a Class A, or god forbid, water, to try to put out a venting battery, chances are you're going to create a disaster.
They are cheap.........get one.
Tootle puffer stuff can go out, too. Had a knock off ego clone that did. Also a bad charger that blackened my outlet/wall and cost me $200 in electrician bills. Now I use a charging strip, and flip the button (my hand was ON the charger when I plugged it into the wall and it went kaboom.....boy that was dumb of me).
Out of millions of things produced, there is bound to be an item once in a while where the wiring is just not assembled properly. That is with everything, not just ecigs. My elecctrician determined it was the wall charger......he opened it up.