We have a 400 with the dual 6v AGM batteries. Ours are buried in the trailer under the bed and are super heavy. Not easy to get out. If you have a regular flooded battery and it's not hard to remove I would remove them and keep them in the garage on a trickle charger over the winter. That's what I used to do with our old pop up camper. When it comes time for you to upgrade your batteries I would go with AGM. Either a single group 31 if you have space or dual 6v.