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 - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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