For the most part, it’s simple. Your car or truck has a battery, it supplies electricity to the bits that need it, and that’s all you care about. Until something goes wrong or you want to do something ...

Your car won't start. You have a dead battery. We know, it's a pain! You'd like to pull it out and get it checked at an auto parts store or maybe even replace it—and you want to do it yourself to save ...