If you are really using a "Battery Tender" (Deltran) you should leave it connected 24/7/365. The Battery Tender is a computer controlled battery maintainer that reads the battery voltage and adjusts the charge level accordingly. It will not over charge the battery. I had one connected to a motorcycle battery for over 6 years ( continually when not actually riding it) If the battery needs to have a specific amount of energy replaced, it does not matter if it is replaced in two hour blocks or all at once.
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