Skip to Content

How Do I Know Which Car Battery Fits My Car?

Power - by Joe Weber - updated on 9/16/2024

Checking the fluid levels of a flooded auto battery

Every car owner knows that uneasy feeling when it's time to replace the battery. With so many options available, it can be overwhelming to determine which battery is the best fit for your car. Picking the wrong one can lead to frequent replacements or even prevent your vehicle from running electronic accessories efficiently. In this guide, we'll walk you through some essential tips to help you choose the right car battery every time.

Understanding Car Batteries: Not All Are Created Equal

Car batteries aren't one-size-fits-all. A powerful V8 truck and a compact 4-cylinder hatchback won't use the same battery. Installing the correct size ensures your vehicle starts reliably and powers all electronics efficiently.

Car batteries are categorized by the Battery Council International (BCI) group size standard. This classification helps you identify the correct battery size for your vehicle, whether you're searching online or consulting your car's manual. However, the BCI Group size is just the beginning. You also need to consider the power demands of your vehicle, including cold-cranking amps (CCAs), battery design, and warranty.

What Is a Battery Group Size?

Each vehicle battery is assigned a BCI group size code that refers to its physical dimensions, terminal types, and specific requirements for your car. These group sizes are typically based on the vehicle's make, model, and engine size. While some vehicles can accommodate more than one group size, it's important to choose a battery specifically designed for your car. Below is a list of commonly seen BCI Group sizes:

Group Size Commonly Seen In
24/24F (Top Terminal) Acura, Honda, Infiniti, Lexus, Nissan, Toyota
35 (Top Terminal) Honda, Nissan, Subaru, Toyota
65 (Top Terminal) Ford, Lincoln, Mercury
48 (Top Terminal) Acura, BMW, Cadillac, Chevy, Ford
75 (Side Terminal) Chrysler, Dodge, GM
34/78 (Dual Terminal) Chrysler, Dodge, GM

Note: This chart is for reference only. Always confirm the correct battery size with our experts at Batteries Plus or use our fitment finder on batteriesplus.com.

How to Determine Which Car Battery Fits Your Vehicle

Finding the right battery for your vehicle is easier than you think. Here are a few methods to help you identify the correct battery:

  1. Check the Owner's Manual: The battery section of your car's manual will list the recommended BCI Group Size and minimum CCA.
  2. Look at the Existing Battery: The current battery's Group Size is often labeled on the top label or front of the battery. Be sure to verify that it meets your vehicle's requirements.
  3. Use Online Tools: Numerous reference tools are available online to look up your vehicle's battery size. Batteries Plus offers a convenient fitment finder where you can select your car's year, make, model, and trim to see all available battery options.

Once you've identified the right size, consider factors like cold cranking amps (CCA) and battery type to ensure they can handle your vehicle's power needs in all weather conditions.

Cold Cranking Amps (CCA): Why They Matter

Choosing a battery with sufficient CCA is critical, especially in colder climates. A battery below the recommended minimum CCA can struggle or even fail to start your engine. The cold cranking amp requirement is usually listed in the Owner's Manual or on the existing battery. However, it's always a good idea to confirm the correct CCA with a Batteries Plus expert.

For example, the 2020 Toyota RAV4 XLE 2.5L 4-cylinder has a minimum requirement of 605 CCA. Batteries Plus offers several options for this vehicle, ranging from around 720 CCA to 800 CCA, all of which will perform better than the original battery in cold weather.

For more detailed information on cold-cranking amps, check out our blog post, "How Many Cold Cranking Amps Do I Need for Cold Weather?"

Types of Car Battery Designs: Flooded vs. AGM vs. TPPL AGM

Understanding the different types of car batteries can help you make an informed choice. Here's a quick overview:

  • Flooded Batteries: The most common type, but they struggle in extreme temperatures and require regular maintenance.
  • Absorbed Glass Mat (AGM) Batteries: Designed for extreme conditions and vehicles with high electronic demands. AGM batteries are maintenance-free and generally offer longer life and better warranties.
  • Thin Plate Pure Lead (TPPL) AGM Batteries: Ideal for enthusiasts and those who heavily rely on their vehicles, these batteries (like our X2Power brand) provide the highest CCAs, fastest charging times, and longest lifespan.

It's important to remember that If your vehicle originally came with an AGM battery, replacing it with another AGM is necessary—you cannot downgrade to a flooded battery.

Battery Registration: An Important Final Step

Many newer vehicles require battery registration, a process that ensures your car's computer allows the charging system to properly charge the battery and powers all components efficiently as the battery ages. Don't skip this quick but crucial step.

Get the Best Car Battery at Batteries Plus

Visit your local Batteries Plus store to speak with one of our experts who can help you find the perfect battery for your vehicle. Not sure if you need a new battery? Bring in your old one or have us test the battery still in your car—free of charge.

For more information on how car batteries work, read our blog post, "How Does a Car Battery Work?" Need more details on different battery types? Check out "Flooded vs. AGM: What Is the Best Battery for Your Car or Truck?".

Need a new car or truck battery?

Shop Car & Truck Batteries