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Under most conditions, a typical lead/acid battery should last five years, or longer. I’ve run diesel boats with lead acid, and AGM battery banks, and found that experience to be the case. Rarely do you have to top off your batteries, but you should check them regularly, first weekly, then monthly, to be sure. If they start “loosing “ water, at that point you start questioning why. Battery maintenance is really pretty straight forward and simple. And it’s all about amp hours. Two 6 volt units will deliver more amp hours than two 12 volt units.
Happy travels
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