I'd take the battery home and put it on a maintainer unless you are using the tractor frequently to keep it charged. You can put an Anderson type connector on the cables to make it easy to remove and it will serve as a disconnect as well.Resurrecting an old post . . . I need to leave my tractor at my land, 10 miles from my home and am interested in a battery disconnect as additional theft deterrent.
I worked on boats for many years and every boat I worked on that had a disconnect switch from the factory, and most did, had them on the positive side.