I have an Interstate brand grp 24 or 27 "dual purpose" battery as my starting battery. Excellent battery. Last season I added two [2] "31DCXC" Harris batteries [wet cell] for my house bank. I think these are group 31s with about 110 amp-hour capacity [google "Harris Batteries', in Ohio to be sure]. As others have responded, these all reside under the aft cabinet berth.I will say the current house bank has a lower profile than what they replaced. I had to glue a 1/2" wood strip to the front ends of the cover boards in order to ensure clearance for the old batteries. Hope this helps. Pete W. Siren Song'91 C&C30-2Deltaville, VA.
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