(What the secret codes on your battery's label won't tell you, of course, is which are the best batteries and which ones to avoid. That's what you'll learn in our ranking of major car battery brands.) ...

Interstate Batteries’ premium AGM option can supply 950 cranking amps, weighs 45 pounds, and costs less than $300. A ...

If you have a car battery that doesn't make it abundantly clear which post is positive and which is negative, there are a few ways to be sure.