Two of the old batteries wouldn’t hold a charge, and the other two were low capacity, unfortunately mostly due to neglect (not being kept topped off with water).
The old ones were 4 Rolls-Surrette EIGH 262, each of which is 6V and 262Ah (at the 20hr rate).
The new ones are 4 Rolls-Surrette S460 (pdf datasheet here), each of which is 6V and 350Ah (20 hr rate). They are marketed to the solar energy crowd, which is why they quote the capacity at 460Ah at a 100hr rate, which just isn’t the way us sailboat people measure it.
The new batteries are exactly the same footprint as the old ones, but about 5 inches taller. As a result, we had to remove the old battery box and modify it to allow for more headroom (there are things mounted over the batteries close enough to have prevented them from fitting). I cut out the bottom of the box on the left side and dropped it down, cut side pieces, lightly screwed it together, then jonny glassed over it, then we painted it with a couple coats of Primekote epoxy paint.
Remaining: fabricate new acrylic cover to go over the top (to protect against tools, or the furnace cover, from shorting out on top of the batteries), and add buckles to the webbing straps.
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