In regards to the batteries, I haven't found information on what type of batteries the ship uses. However, new Sodium-ion batteries could be a good option for the ship's requirements.

Sodium-ion is heavier than lithium counterparts but should be cheaper (uses sodium instead of lithium, cobalt, etc) and potentially offer greater charge, lifecycle, and safety performance.

CATL Sodium-ion news article: https://www.catl.com/en/news/665.html