I would also add to make sure there's a good battery management system (BMS).
Apparently very easy to build your own lifepo4 battery bank using (prismatic) cells connected in series and extremely cheap to diy- huge power for much much cheaper than trying to afford a higher power battery. This is my next upgrade.
Works extremely well if using LEDs etc Victron energy has all the info. My project was to upgrade power on my old (fixer upper) boat so I only needed 12v info Delighted with result.
Plenty of info around once usecase gets more specific... I focused on sailing specific forums etc I mean... Envision LiFePO4 315Ah Prismatic Cell (Grade B) for less than £50
Legendary... literally for a change