I just replaced my batteries on a Cat 30 with (2) Trojan Group 27 AGM's. Practical Sailor just rated them the best battery in their head-to-head tests. I only have room for standard batteries, and did not want to start making major modifications to try and fit larger batteries. I am sure their are many who can weight in on other options available.
If you've got refrigeration, you are going to need some meat. I have two 8d's on my boat. They are a real pain to get at, but they give me plenty of juice. I'm not looking forward to replacing them (when the time comes)...they aren't cheap.
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