Posts: 3508
Location: Elk River, Minnesota | Hiya,
A deep cycle battery is not designed for the quick draw down and recharging...they are designed for slower draws and slower charging.
The BEST thing you can do for what you are asking is to pick up a dual purpose battery that is designed both for starting purposes and for deep cycle purposes. This allows you to run your electronics without running the battery down from fishing for long periods of time without running the outboard.
In either case, I don't think you would have any issues of the battery being detrimental to the motor, unless for some reason you hook up the batter backwards, but most motors have a main fuse that will blow before damage could occur.
Steve
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