Group 31 12-Volt commercial batteries are for heavy-duty purposes such as heavy trucks, buses, coaches, and more.
The Group 31 batteries are an extremely popular BCI group size. It can be overwhelming as you attempt to compare and decide what the best brand and style for your application is.
Generally, these batteries will range between a 100-amp hour (Ah) and 125Ah, 600 cold cranking amps (CCA) and 1150 CCA, and 150 reserve capacity (RC) and 230 RC.
It depends on whether it is a thick plate deep cycle or thin plate stop/start battery, or a dual-purpose combination. The dimensions should be roughly 12.90 x 6.75 x 9.25 inches.
What does ‘group’ referring to a battery mean?
This refers to the battery size that best fits the physical dimensions, terminal locations, and type required for your vehicle.
The Battery Council International (BCI) assigns numbers and letters for each battery group size. Group size is typically based on your vehicle’s make, model, and engine type.
Although some vehicles may accommodate a battery from more than one group size, it is important to use a battery approved for your vehicle.
Consult a replacement guide to find the battery group size that works for your vehicle. Also, ensure your new battery will fit and be held down properly according to the vehicle manufacturer’s specifications.