Upgrade the electrical system in your 1999-2003 Ford 7.3L Powerstroke with new batteries. Dual batteries were available on many diesel trucks. If your truck has two batteries, both should be replaced at the same time. 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. Even under the most ideal conditions, chemical reactions cause batteries to slowly break down. 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.