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Message: <blockquote data-quote="thill" data-source="post: 509671" data-attributes="member: 4972">I ran a group 31 deep cycle for years for starting and house, and it served me very well.   No issues, even with all the stuff I have on the boat, including a 300W stereo system, (2) GPS units, lights, radios, powered livewell, etc.I had two trolling motor batteries as backup, but never needed them.  Have had the starter turn over a little slow, after sitting a long time, but never had it where it wouldn't start.   Even so, for overnight trips, I would even bring an extra battery as backup, but never needed to hook it up.I guess it depends on what boat you have, how long you sit without running the motor and what you are running while sitting.</blockquote>