Checking if something has a 1 in 10m probability of failure, is the wrong idea. The question should be 'What if it does?' and that wasn't adequately answered he

Checking if something has a 1 in 10m probability of failure, is the wrong idea. The question should be 'What if it does?' and that wasn't adequately answered here. There didn't seem to be any thermal isolation between cells, and a questionably risky type of Lithium-Ion chemistry.