Not sure when I'll use a regulated device again, if ever. This though does provide a point of reference. I'm using a mech and know I don't want to push a 3.7V battery to firing too much over 2A per draw. I like allowing for what's called "head space" which leaves about 20% of a charge on a battery to avoid "pushing" too hard.
So far I averted one possible explosion and one venting. Both times I'm not quite sure what happened. The venting come on at random although having gotten batteries that were possibly re-wrapped Efests I suspect had something to do with it. The explosion, well now, I am damn careful about building coils cleanly and avoiding any metal debris to entering the battery cap threading. I believe that is what caused that one. I rushed the battery out of doors to a place away from people and property, let it set about a week. Put it up to be recycled later on once I win a lottery.
Don't let these two mishaps paint me as someone being unsafe with mechs. I am fairly safe in my use of them. Everyone knows though, there's no iron clad guarantee accidents will not happen. So far as I point out, I've been lucky to avoid serious dangers. I remain vigilant regarding that "third time is a charm" rule, too. Fuck that, I don't want that kind of hurt for myself or anyone else. Ergo, I use mechs as safely as I can. It isn't difficult to exercise good sense, keep your device clean, maintained. It is worth it though because I don't need to get an electronic brick.