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Can I use a different battery group size?

Yes, you can typically use a different battery group size in your vehicle, as long as the new battery meets the minimum requirements for your car or truck. However, there are some important factors to consider before making the switch.


Understanding Battery Group Sizes


Battery group sizes refer to the physical dimensions and terminal configurations of automotive batteries. Common group sizes include 24, 34, 35, 47, 51, 65, 75, and 78. The group size determines whether a battery will physically fit in your vehicle's battery tray or compartment.


In addition to size, batteries also have different cold cranking amps (CCA) and reserve capacity (RC) ratings that indicate their power output and runtime. Choosing a battery with the right CCA and RC for your vehicle is crucial to ensure proper starting and electrical system performance.


Factors to Consider When Changing Battery Group Size



  • Physical Fit: Measure the battery tray in your vehicle and compare the dimensions to the new battery to ensure it will physically fit and be properly secured.

  • Electrical Compatibility: Verify that the new battery has the same or higher CCA and RC ratings as the original to maintain starting and electrical system performance.

  • Terminal Configuration: Check that the positive and negative terminals on the new battery are in the same location as the original to allow for proper connection.

  • Warranty: Using a non-OEM battery may void your vehicle's warranty, so check with your manufacturer before making a change.


As long as you select a replacement battery that meets or exceeds the original specifications, you can typically use a different group size without issue. However, it's always best to consult your owner's manual or a professional mechanic to ensure a safe and proper installation.

Kevin's Auto

Kevin Bennett

Company Owner

Kevin Bennet is the founder and owner of Kevin's Autos, a leading automotive service provider in Australia. With a deep commitment to customer satisfaction and years of industry expertise, Kevin uses his blog to answer the most common questions posed by his customers. From maintenance tips to troubleshooting advice, Kevin's articles are designed to empower drivers with the knowledge they need to keep their vehicles running smoothly and safely.