@menherahair@eientei.org @deprecated_ii@poa.st The issue seems to be that the battery supplier was pushing the limit on energy density, which allowed dendrites to form, which cannot be seen by visual inspection, which means the batteries ended up lighting up; https://en.wikipedia.org/wiki/2013_Boeing_787_Dreamliner_grounding?useskin=monobook It seems the fires wouldn't have happen if they just used some decent Chinese LFP cells - but the battery would then be a little heavier.