Many newer vehicles will kill a battery when parked and not started after just 30 days. So yes, if a vehicle is not driven constantly, it needs the battery unhooked or a maintainer. Not so much of an issue if the auto is old enough to NOT have constant draws like an alarm, ECM memories, etc. Even my 1998 Dodge Grand Caravan will kill a full charge battery in one month. It even gives the warning in the owner's manual.
Unhooking a battery can be kind of a pain in some areas when it causes errors in the emissions controls system. Maintainer makes things easier. Well - except when I had not driven a car in two months and then drove off with the battery-maintainer still plugged in.
Many new cars and trucks leave the factory with a built-in 100 milliamp draw on the battery, all the time. A typical car battery is around 60-70 amp-hours. The math to calculate is not pure linear, but . . 1 amp for 70 hours is dead in 3 days. So at 100 milliamps - just a guess with simple math - it takes 30 days.
Old tractors should not have any built-in draw. Regardless, batteries all have a self-discharge rate and that rate gets higher as batteries age.
I have a maintainer on the battery in my 1985 diesel Isuzu truck. Battery is 14 years old. When it was new - it could sit for a year and still start right up. Now? If I take the maintainer off, it goes dead in one day. Seems good batteries die very slow deaths and just self-discharge beyond a tolerable point. Since my Isuzu is just a "yard buggy" that rarely gets used - I am fine with the battery until it goes dead in less then a day.
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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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