Give your 2001-2004 Chevy/GMC 6.6L LB7 Duramax a big boost in electrical power with new batteries. Shop XDP today and get a new battery for your vehicle. XDP carries leading battery manufacturers such as Odyssey, and more! The average life expectancy of a battery is typically between three to six years, but there are several factors that can have an impact on that estimate. There are several signs to indicate the battery in your truck is failing and needs to be replaced. Sluggish engine cranking or headlights that are dim or flickering are telltale signs of trouble. Many heavy-duty diesel trucks came equipped with dual batteries. If your truck has two batteries, it is recommended that both batteries are replaced at the same time.