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Marine/RV batteries aren't true "deep cycle" batteries. Yes, they have a threaded post on top, but that's not the difference. You can tell the difference when you pick the batteries up. A deep cycle battery is considerably heavier. Also, it will say "Deep Cycle right on the label.
Those Marine/RV batteries have no business in being in an RV, and the dealers only install them because they are considerably less expensive than a real deep cycle "battery."
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