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4 batteries in an 18' skiff? That's overkill. You only need two with a Perko battery switch. place on 1 to use for starting and 2 when the engine is off to run your electronics and pump(s). When running switch to all/both to recharge the batteries. Keep the other two batteries on a shelf on a trickle charge to keep them topped off. Better yet sell them they have a limited life. When the two in the boat go bad buy new and you will know where you are starting from. When the boat is laid up keep them on a trickle charger.
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