All lead-acid batteries lose 5%-30% per month of their charge. All depends on the metals in the battery AND how big it is. The more antimony used inside the battery, the faster it goes dead. Just because it starts a tractor after sitting, doesn't mean it's not partially discharged.
Antimony is added to the lead plates in batteries to make them more vibration resistant. So, the more HD a battery is, the faster it will self-discharge - and more it might need to be run more, or stuck on a maintainer.
AGM batteries (like Optimas), don't use a lot of antimony in the plates since the glass-matts help with vibration resistance. So, AGMs typically only lose 5%-10% per month.
In theory, a battery can last much longer if never left in a state of discharge. A battery can be near dead at 12 volts and still crank a tractor pretty well. 12 volts means a battery is 80% discharged. A fully charged battery is 12.9 volts. Most 12 volt systems crank at 9 volts.
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Today's Featured Article - Product Review: Black Tire Paint - by Staff. I have been fortunate in that two of my tractors have had rear tires that were in great shape when I bought the tractor. My model "H" even had the old style fronts with plenty of tread. My "L" fronts were mismatched Sears Guardsman snow tires, which I promptly tossed. Well, although these tires were in good shape as far as tread was concerned, they looked real sad. All were flat, but new tubes fixed that. In addition to years and years of scuffing and fading, they had paint splattered on
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