I've gotten 10+ years out of quite a few of the batteries I've had in my daily drivers. My '96 Ranger battery went 12 years, my Taurus battery went 11, and the battery in my '01 Explorer is original and still going strong. I purchased a new Craftsman garden tractor in May of '99, (it was a carry-over and was actually built in '98), and the original Diehard battery in
that was just replaced this summer. The
least amount of life I've gotten out of an OEM battery that I can recall, is in the motorcycle. Bought the '03 bike new, and replaced the battery this spring.
Nope, none of them are wired to a battery maintainer. I have one, but I only bought it for the bike when it sits in storage. The lawn and garden battery situation even surprised me. 10+ years out of one of those is exceptional, but when I start it, it gets run for 2-3 hours before getting shut down. When the neighbors on either side of me get their lawn tractors out of the shed, it's a different story. They fire 'em up, and then putt across the yard to hook up a trailer or something....and then shut 'em off. Then they fire it up again and putt up the driveway to fill in some low spots with gravel or whatever, and shut it off
again. Then they restart, move a few feet....and kill the engine again. Over, and over, and over...
My "technique" probably does help them live a bit longer, but temperature is a factor as well. Heat is by far the biggest battery killer.
