What Size Battery Do I need On My Yanmar Tractor?

Typically a Group 24 battery is what is used in most of the Yanmar YM series and F series tractors but the best way to get the correct battery for your tractor is to just take the old battery in to the parts store with you. They will be able to match it up there. You will have to take your old battery in anyway for a core so this is the easiest way to be sure you get the correct size & terminal type.

If you don't have a battery then the best method is to just measure the size of the battery tray and match up a battery that way.

Getting a battery with a higher CCA will not hurt anything. Getting a battery with a very low CCA will make the tractor hard to start. Typically any "car sized" battery will be more than enough to start your tractor. The only time you might get into trouble is if you get one of the smaller 'garden tractor' or ATV size batteries. They might not have enough 'oomph' to start your tractor - especially in the cold.