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Message: <blockquote data-quote="THATpurpleKUSH" data-source="post: 8720452" data-attributes="member: 615398">Use the alt to charge the batteries. Boats always come with tiny alternators so upgrading would be a wise choice. What used used to do was use a dedicated starting battery and then a huge deep cycle for the electronics. Start the boat on 'all' or the starting battery and keep it on 'all' when under way. When it's time to relax, switch to your deep cycle so you aren't risking draining the starting battery. You could also look into a solar charger to assist when the engine isn't running.</blockquote>

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