My batteries are at 6 years and still holding up well but going to replace them this year. Since I plan on keeping this truck until it actually dies, or I do, I'm springing for a pair of Odyssey 1,750A, 930 CCA batteries. I've had an Odyssey on my '98 Buell since '99, abused the heck out of it including 3 years in Montana and it's still going strong. Figure I'll get 10 years out of them in the truck... by then all vehicles emitting anything except water vapor will probably be outlawed! Besides, adding a winch and air compressor so want the extra battery power.