Thank you Andrew for commenting on the use of water to extinguish a Li ion battery. You are 100% correct. In fact, there is a lot of test data that has been produced by NFPA that shows water is the most effective (and safe) way to suppress a Li ion battery fire. Water also immediately cools down any adjacent cells to prevent propagation.
The heading that states “All Batteries are Hazardous Waste” is also wrong.
This website should be corrected ASAP.