I think that if water did get to a level of the internal floor, the electrical system will get wet. When you pull the floor covering up in the left or right rear floor pan, you can see the drain plugs. The battery may sit in a separate tray that is higher than the floor level but I didnt see that. There are plenty of photos showing the under seat battery compartment and to be honest, if it floods that high, we’ll have all sorts of other issues, like floating away. I should add that the door sealing if very good to the extant that when you pull them closed, you need to be positive. The dealer where my one is residing suggested that the internal air pressure goes up noticeably when you shut the doors..