Re: Fake News
Pat, li-ion batteries don't go on fire when they get wet, and the recommended action in the case of a li-ion fire is to douse it with large amounts of water (or place it in a bucket) to cool the surrounding cells and any other combustibles and stop the fire spreading. See the FAA document here.
There is this odd urban myth that just because it has lithium in it, it will spontaneously combust when it gets wet, but this simply isn't true. The quantities of metallic lithium are very small, and very well sealed in plastic etc.