I'm now sat next to a nasty piece of lithium. I'll pour water in it, will it explode? I bloody well hope not, because my COSHH is going to look a bit bad. Oh guess what, it got a bit angry.
These batteries that are likely to suffer from "thermal runaway" should not be allowed on aircraft. I know they are currently class 9(RMD), but they should be not allowed. Anyone brave enough to do that.