Am I looking at this wrong?
Lithium batteries require the respect of gasoline. They are almost no more mysterious-
-physical damage to the cell = possible destructive/runaway discharge
-degraded anode / cathode = possible destructive/runaway discharge
-shit bms = same
Unless using an axe or drill on a large or fully charged pack that's tightly enclosed, it's almost 100% you'll see the possibility of fire during charge or discharge, but mostly charge, yes?
So knowing the condition of your cells and keeping the pack from damage (like a gas tank) are the first tier of 'respect', and then personally monitoring during charge/discharge? With no cheap 'bms' circuitry to go sideways during periods of unuse, and wires properly done and protected (the 'gas' lines), I bet you'd be more likely to get hit by a bus on a deserted island than have a fire?
At least as likely for your car gas tank to 'spontaneously' combust? I don't quite yet bet a lithium fire against either though, because they are bad little bitches and deserve the same trust lol. (no offense ladies