One Duralast Platinum AGM battery in the common group 48 size failed our tough life test at just five weeks; another bit the dust after six weeks.

That said, AGM batteries (more on that in the FAQ section) ... According to Autozone, “the average car battery life is between three and five years.” This can, naturally, vary.

AGM batteries improve on a major flaw of flooded batteries, ... chain auto parts stores such as AutoZone and Advanced Auto Parts offer free battery testing and charging services.

They specialize in AGM and Lithium variants, no lead-acid, with high-performance use being the focus. Most batteries have a one to three-year warranty with a 60-day risk-free guarantee from the brand.