Find Your Car Battery Group Size

Car batteries are classified by group size—the case dimensions and terminal orientation—matched to your vehicle’s make, model, and engine. Some cars accept more than one size, but use only a size approved for your vehicle. Also ensure the battery meets the manufacturer’s Cold Cranking Amps (CCA) spec. Not sure? Your local Battery Guyz rep can confirm the right group size and CCA.

Step 1 — Check your current battery
Find the group size on the battery label (top or side of the case). It’s usually a two-digit number, sometimes followed by a letter.

Step 2 — Check your owner’s manual
Look in the Specifications section for the battery group size and other required battery specs.

Common group sizes

  • 75, 78, 79, 100
  • H, 24, 24F, 34, 35, 41, 42, 48, 51, 58R, 65

Part 2 — Find your battery’s minimum CCA

Your vehicle needs a minimum Cold Cranking Amps (CCA) to start—especially in cold weather. If the battery’s CCA is below spec, the engine may not crank. Check your owner’s manual (or under-hood label) and choose a battery that meets or exceeds the required CCA for your vehicle.

Step 1 — Check the battery label

Look for a number followed by “CCA” on the top or side. If the battery isn’t original—or the label is faded—verify the number using another source.

Step 2 — Check your owner’s manual

Find the minimum CCA required in the Specifications section.

Step 3 — Choose the right CCA

  • pick a battery that meets or exceeds the minimum CCA for easier winter starts.
  • higher CCA can also help, but prioritize a quality battery rated for heat.