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 - My Ford Golden Jubilee - by Troy Estes. This article is about my '53 Ford Jubilee and a story that starts with taking the tractor to my brother's Starter/Alternator Rebuilding shop for a wiring fix. The generator was shot as well as all the wiring. I dropped off the tractor expecting a transformation from a 6 volt to a 12 volt system utilizing the original generator housing, and a total rewiring of the whole tractor. The front end center pin bushing was worn also so I ask that they replace it if they had time. Well, that’s wha
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