Duracell 6 volt batteries

As Robert posted heat and degree of discharge are two big factors of the life of a wet cell battery. I live in Ct, much cooler than Fl, have the same batteries that have never been discharged past 50%SOC, and these same batteries have lasted 12 years so far. They sit all winter with no charge and only self discharge about 20 %. I don't hear much discussion about leaving the batteries on a charger vs off the charger until they self discharge to 80% soc then charge fully and how that affects the battery plate life. I would think the plates would be eaten away quicker with a constant charge routine. I realize most batteries die of sulfation first rather than plate reduction so charging is important, but I would think there is a sweet spot between the two, just have not heard it discussed.