I have a 1985 Cat 30, and the batteries are located under the nav. table in that cabinet. They were there when I bought it, but it should be easy to do. The cables run to a bat. switch on the panel and from there under the stbd side of the cabin to the engine. Good Luck.
Don't forget that the farther you move the batteries from the battery selector switch, the lower the voltage to the starter. You may want to consider going to the next larger cable size to reduce voltage drop.
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