@Michael, insurance has a different point of view on lithium 🙂 it is about stats and making money.

here is a quote from AAC website on tips about insurance. One of them about Lithium. 

https://www.morganscloud.com/2021/07/05/27-tips-to-get-insurance-for-offshore-voyaging-part-1-us-and-our-boat/

And while we are thinking about excuses underwriters can use to say no, think very carefully before adding new technology to your boat. For example, two AAC members were turned down by a major American underwriter because their boats have lithium batteries.