The difference being that the lead is thicker on the cells. When the battery drains down, the lead is erroded, on a car battery, as its got less lead (thinner anyway) in it they get erroded quicker. A leisure battery has thicker plates so lasts longer so they errode, but can take it (deep cycle).
Its not a con, its one of those things thats genuine and its also about the same price for a leisure one v a car one.
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