This just confirms my conviction that if I ever do use a mech, I'm drilling a ton of holes in it or cutting slots.
Look, you guys can beat him up all you want (within Moderator's discretion. ~~~~ Robino

) but the point is that even if the battery vented IT SHOULD NOT HAVE BLOWN UP in this day and age of vaping. Period.
Now, I can also add that many have theorized that it wasn't a safe chem battery. In that case, if the mod is designed for safe-chem-IMR only, I suppose that's an excuse.
But someone explain to me how it actually blew apart. Even with total internal battery failure or whatever. These things are supposed to be A) Vented and B) use hot springs or other such features.
I'm certainly not a mech expert, nor do I know this particular device. Some said spring loaded center pin, others say no. Even if the center pin failed, the battery top should not be touching the pin unless the button is pushed AND the hot spring should retract IF it has one.
So it would take
1) Button depression and very low ohms stressing battery
2) battery top to ground (shell) short with battery top somehow in contact with the pin and battery ground in contact somewhere along the battery with the shell.
Also confirms my conviction that .2 ohms it a bit too close to a dead-short. IDK if we can tell if it dead shorted or if it was just "perma-on" running through a .2 ohm (supposedly) coil.
One set of specs on VC5's I saw said it was a 30 amp battery. .2 ohms at, say, 4.0 volts is 'only' 20 amps and 80 watts. So maybe it was a dead short.
Still, mods should be designed to contain this in today's market. IMO. At least with an IMR as they vent slower. But I guess YMMV.

and just IMHO.