It takes tough truck batteries to power all the essentials on your truck, such as the on-board computer system and lights, as well as accessories such as the entertainment system. Most truck batteries are rated to last give or take five years. But with age, wear and various other factors, your heavy vehicles electrical system may require a new battery sooner than you think. Signs that its time to replace your trucks batteries are slow starts, dim headlights, and sluggish electrical accessories.