Art - All batteries will deteriorate in time but the one kept fully charged (without overcharging) will last the longest of all. Of course the batteries must be used for their purpose, and hence discharged; the first prize is therefore to discharge them as little as possible which then means having as many as possible to spread the load. It is also a fact that different types of batteries have different charging preferences. The "smart regulators", so-called, are really just devices for changing charge rates and setting charge periods, usually programable by the boat operator. Sometimes they have a "preset" program but I think they are still only as "smart" as the operator.
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