What is a Battery Group Size?
A battery group size is an industry-standard for car batteries that indicates the actual, physical size for a car battery (Height x width x length), as well as the polarity (where the positive and negative battery posts are located on the battery), allowing the vehicle manufacturers to take the battery size into consideration when designing a car, truck, SUV or other vehicles. Battery group sizes also provide a simplified, industry standard in automotive batteries, helping manufacturers of batteries and vehicles alike to reduce costs. Having standard battery group sizes makes replacing your battery at your local Firestone Complete Auto Care store simple, and our technicians and automotive advisors can ensure the proper battery fitment for just about any vehicle on the road.
Helpful hint: instead of trying to measure the exact size of your car battery with a tape measure, look for the "Group Size" to be printed on the label of the battery. You can also call or visit any local Firestone Complete Auto Care Store to verify your vehicle's correct battery replacement with the vehicle year, make, and model.
Different Battery Group Sizes
Certain vehicle manufacturers tend to use specific group sizes more than others. For example, many General Motors vehicles use (and/or used) a side-post battery. Side post batteries have cable ends that screw into the side of the battery, as opposed to having battery posts on the top of the battery. These group sizes are typically 70, 74, 75 and 78.
European vehicle manufacturers (Volkswagen, Audi, Mercedes Benz, BMW, etc.) typically use an "International" style of battery where the top posts are recessed in the corners so that the top of the battery posts are about equivalent to the main height of the battery. Many of these international (European) battery group size fitments have a specialized ventilation system as part of the battery, and some are also installed in the trunk or even under the back seat (as opposed to the typical placement under the hood). These group sizes are typically 41, 42, 47, 48 and 49.
Helpful Hint: the installation process of these batteries is often more difficult than other batteries. While the installation rates may be a little more for these battery group sizes, it may very well be worth it to trust it to the expertise of Firestone's certified technicians. Call or drop by your local Firestone Complete Auto Care store for more details.
Japanese vehicles, many other imports and most American-made vehicles typically use a group size with a standard, top-post battery fitments. These are the most-common battery group sizes that most people are used to seeing. While these are more common and seem easier to replace, it is still important to use the proper group size so that your car battery stays secure in your vehicle's battery tray. For example, some group sizes are the same width and length, but have a lower height. If a taller battery is mistaken for a shorter group size, it may not fit properly in the battery tray and/or battery hold-down, or the battery post could even make contact with the metal hood of the vehicle, causing a spark, a short or a vehicle fire. Again, as a precaution, please consult with your Firestone technicians for the proper battery fitment for your specific vehicle year, make and model. In general, these more-common battery group sizes are 24, 24F, 25, 34, 35, 51, 51R, 52, 58, 58R, 59, and 65.