I always recycle the batteries that I replace on other vehicles into the tractors. If they start to test a little low, I put them on a tractor where there is less draw, and get another 3-5 years out of them. Even after that, they get installed into kids toys (those 6V electric cars etc). Ever see a 6V electric jeep with a tired 12V battery in it? - does almost 10mph. Thermal overload actually kicks in ever 5 mins to give it a cool down, and the kids love it. When a battery really is dead and gone, it brings $20+ in scrap. I noticed the junkyard that buys them also sells used batteries they pull and test from wrecked cars: $35!
