Interesting article from Club Marine on lithium batteries in boats.
They take a surprisingly pragmatic view especially and mainly with lifepo4 chemistry.

“ The latter, also known as LiFePO4, is the go-to for marine house battery installations. They suit deep-cycle usage but, more importantly, studies have shown that the chemical composition is less prone to overheating and won’t self-ignite or self-combust if there’s a failure”
https://www.clubmarine.com.au/explore-boating/articles/technical-safe-use-and-charging-of-lithiumion-batteries.html