Battery life is measured in "cycles" not hours, days or years. Each time the battery is allowed to discharge and then a battery charger kicks in to re-charge the battery that is a cycle. If your battery charger is off for a specific length of time then "samples" the battery before turning itself back on, you are burning cycles - especially if some onboard item like bilge pumps, refrigeration, etc., etc., kicks on when the charger is in an "off" period.
- - Constantly "on" charge battery charges not only keep the battery topped off but they will provide the electricity to run the other equipment should they turn on. Now the battery charger is providing the electricity to run the bilge pumps, refrigeration, etc., etc. instead of the batteries.
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