I got a phone call from a delivery skipper, who is a friend, about this incident. One of his points was that a fire watch is mandatory on such vessels:
46 CFR § 185.410 - Watchmen.
§ 185.410 Watchmen.
The owner, charterer, master, or managing operator of a vessel carrying overnight passengers shall have a suitable number of watchmen patrol throughout the vessel during the nighttime, whether or not the vessel is underway, to guard against, and give alarm in case of, a fire, man overboard, or other dangerous situation.
There is nothing about the size of vessel, or number of passengers--this is a requirement period.
He was of the impression (for several reasons) that the crew had little if any fire fighting training. One point he made is apparently someone opened the door to the galley--and that would give more oxygen to the inflatable gas and material.
Many of my professional mariner have mandated fire fighting training on a regular basis--just as CPR and First air certification is also required.
The various types of li ion batteries have different risks of explosion or over heating. As many technical items they must be respected. I have 200 amp hours of 12 volt LiFePO4 batteries under my bunk. Perhaps I should put a fire suppression system there? But Have redundant temperatures sensors from the battery chargers which serve these batteries. Also the large batteries, have internal protection from thermal run away--which usually happens either during high capacity charging or discharge. (Ie the battery conducitn shuts down internally if the temp or current exceeds a certain limit. Small batteries don't have these type of devices.
We won't see the final report for 12 to 18 months. But CG has issued several bulletins about standing fire watches, and about safety precautions with any battery charging system.