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Yes they do last a certain time.It's far better to top them up every day than to run them well down before charging.If you take 2 identical deep cycle leisure batteries and run one down to 50% discharged and the other to 80% discharged the 50% discharged one will last approx 3 times as long as the 80% discharged one.Got this info from a leisure battery manufacturers tech dept.CheersAndrew