Note that the regs cover systems over 50 amp hours on 12 volt systems, 600 watt hours on AC. But the reading here will be helpful. One is from BoatUS and the other is from a marine battery manufacturer. If the links don't work just go to these sources.
https://www.boatus.com/expert-advice/expert-advice-archive/2023/february/the-latest-on-lithium-batteries#:~:text=ABYC%20Standard%20A-31,%20E-10,%20and%20E-11%20address%20all%20battery%20and
https://battlebornbatteries.com/what-are-the-abyce-13-standards-for-lithium-on-boats/#:~:text=The%20newest%20guidelines%20from%20the%20American%20Boat%20and%20Yacht
Actual access to the ABYC E-13 PDF needs membership or buying it at $130. If it is important to anyone, I can get one of our guys with ABYC membership to download it. But if I post it here ABYC may come and arrest our Commodore. Or at least say bad things about us.
Thank you! I just received 2 new Li batteries and a charger for my Compac 19. Solar panels are next.