Originally Posted by LouAnn34
Three fit in the original box and the fourth is next within a plastic battery box in the cockpit port locker.
I hope this helps.
by MaineSail may be of help re: chargers.
But looking at your photo, I am wondering how you've got your batts interconnected. Here is how I would expect a house bank of 4 Group 31's connected (diagram courtesy of another Maine Sail thread
on 1/both/2/off switches here).