Car Battery Buying Guide: Group Size and CCA

The three numbers that matter

• Group size — the physical size and terminal layout. It must match your car exactly.
• Cold Cranking Amps (CCA) — starting power in the cold. Match or exceed your vehicle's spec, especially in cold climates.
• Reserve capacity — how long the battery runs accessories if the alternator quits.

Flooded, AGM, or EFB?

• Flooded — standard and affordable.
• AGM — handles heat, deep cycling, and start-stop systems; required on many newer cars.
• EFB — a middle ground for entry-level start-stop vehicles.

When to replace

Most batteries last 3 to 5 years. Slow cranking, dim lights, or a swollen case mean it is time.

Before you buy

Find the right battery for your vehicle by year, make, and model. Free shipping and easy returns.