@jwildeboer FWIW, I recently had an albeit non-scientific discussion with the fire marshal of a city about the fire hazard of batteries. My take away from the discussion is that we have to segment the discussion into two - batteries that are made by reputable companies with reasonable safety standards and those that are super cheap (he mentioned buying through Alibaba as being problematic, but guessing both good and bad can be bought there but that people shopping there tend to look for the cheapest thing with the specs they want)