Our 33 MkII has 2 group 27 deep cycle batteries that are 10 and 12 yrs old, still starting and looking after the refrigerator, stereo, radio and nav lights on "extended" day sails. We're always plugged in when at dock. We select one battery for starting and the other for running accessories, and alternate each sail day. Batteries need to be covered! Beyond that I can't help you much. Brad Pulse C&C 33 MkII Lake Huron
I'd rather be sailing
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