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 - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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