This information has been around for quite a while and the more one looks the more one finds, factual or otherwise. Out of curiosity and when I have an opportunity I ask tradies what they think of the Li-on batteries in their cordless tools. Not one has ever mentioned fire, over heating or other battery-related problems (apart from lifetime and cost). I expect these people have no inclination to manage their batteries either. One pattern has emerged however; the high end stuff like Hilti & Festool is reported to last ages. Should be no surprises.