Something the article doesn't say: if your Lithium or Li-ion battery does vent with flame, avoid breathing the fumes or getting any of the ejecta on your skin. It can have some nasty stuff in it. If you do get it on you you need to take it very seriously. You may think you are OK at first, but after a few hours the compounds break down into things which poison you, by which time they will have migrated all over your body. There are cases in the Candlepower forums; nobody died, but they were off work for a few days and, eg, unable to drive themselves to the hospital. As I recall, the symptoms included an all-over body rash and the liver going into over-drive to try to metabolise the poison.