Let's not downplay the hazard, either. It's not merely a little alcohol, and fighting a metal fire with reactive materials using water is not in anybody's best interest.
Lithium is not that reactive, it will go in water, but compared to the rest of the alkali (Group 1) metals, it isn't that scary, or reactive, hence why I use it in my Grignard reactions. If I was to go for Na then there would be a disaster.
Halon will most definitely quench an Li battery fire, it may however ignite once the Halon goes.
I've not seen the insides of an Li Battery, I may well slice one open in a fume hood this afternoon. I cannot believe there is that much alcohol in it to combust, if there is then why?