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How to Choose a Car Battery: A Beginner’s Guide

Power - by Joe Weber - updated on 12/27/2024

X2Power Auto batteries on the shelf

Shopping for a new car battery doesn't have to be stressful. With the right information, choosing the perfect battery for your vehicle is easier than you might think. In this guide, we'll cover everything you need to know, including:

  • How to spot signs your battery needs replacing
  • Choosing the right size and CCA for your vehicle
  • The difference between flooded and AGM batteries
  • Tips for finding the best option for extreme weather

By the end, you'll know exactly how to pick a reliable, long-lasting battery. Let's get started!

Recognize When You Should Replace Your Battery

To begin, understanding when to replace your car or truck battery is essential. While common signs like dimming headlights or difficulty starting the engine often signal a weak battery, there are other indicators to watch for that might mean it's time for a replacement.

  • A cracked battery case
  • A bulging battery is usually a sign of the battery freezing
  • The battery won't accept a charge
  • Loose battery terminals
  • Missing filler caps (if applicable)

How to Choose the Right Car Battery

Now that you know what to look for, let's take a closer look at the key steps to ensure you choose the perfect battery for your vehicle.

Step 1: Identify the Correct Battery Size

Car batteries are categorized by size, determined by the Battery Council International (BCI)   Group size. This system ensures you can easily identify the correct battery size for your vehicle. Since car and truck batteries vary in shape and size, it's crucial to select one that fits your specific make and model.

Different types of SLI batteries

You can usually find the battery group size printed on the label of your current battery, located on the top or side. For a quick and accurate way to determine the right battery for your car or truck, use our convenient license plate lookup tool at BatteriesPlus.com. Simply enter your license plate number and state to see a list of batteries that are a perfect fit. Alternatively, you can search by your vehicle's Year, Make, and Model—or even use your VIN if you have it handy!

Step 2: Determine the Required Cold Cranking Amps (CCA)

Every car and truck is designed with specific power requirements to start the engine, especially in cold weather. This power is measured in cold cranking amperage (CCA), which indicates a battery's ability to start your vehicle at low temperatures. Using a battery with less than the manufacturer's recommended CCA can leave you unable to start your car.

To find your vehicle's minimum CCA rating, try the following:

  • Check the label on your current battery for the CCA rating.
  • Refer to your vehicle's owner's manual for the required specifications.
  • Use reputable online resources to look up the minimum CCA for your vehicle.

It's perfectly fine to choose a battery with a higher CCA rating than required, as it can improve performance, especially in extreme conditions. However, never install a battery with a lower CCA rating than the manufacturer's recommendation.

Step 3: Choose the Appropriate Battery Type

When selecting a car or truck battery, it's essential to understand the two main types: flooded lead-acid batteries and Absorbed Glass Mat (AGM) batteries.

Flooded Lead-Acid Batteries

  • What They Are: These traditional car batteries use liquid electrolyte stored in cells within a hard case.
  • Key Features: Flooded batteries are the most affordable option on the market, but they have lower Cold Cranking Amps (CCAs) and shorter warranties.
  • Best For: Vehicles with standard power requirements, such as those without advanced features like remote start or stop/start technology.

Quick Fact: Many cars still come equipped with flooded batteries directly from the manufacturer.

AGM (Absorbed Glass Mat) Batteries

  • What They Are: AGM batteries use fiberglass mats to hold the electrolyte instead of liquid, making them spill-proof and virtually maintenance-free.
  • Key Features: They offer higher CCAs, greater durability, and better performance in extreme temperatures. AGM batteries are also ideal for vehicles with advanced electrical systems, such as heated seats and stop/start technology.
  • Best For: Modern cars and trucks with higher power demands or drivers in regions with extremely hot or cold climates.

Can You Upgrade or Downgrade?

  • Upgrading: If your car originally came with a flooded battery, you can upgrade to an AGM battery for improved performance.
  • Downgrading: If your vehicle requires an AGM battery, you must replace it with another AGM. Downgrading to a flooded battery can lead to performance issues and is not recommended.

By understanding the difference between flooded and AGM batteries, you can choose the right option to match your vehicle's needs and driving conditions.

Step 4: Select Your New Battery

Franchise owner standing in front of the auto battery racks

You've reached the final step—choosing your new battery. This is where comparison is key. Take the time to evaluate your options carefully to ensure you select the best battery for your vehicle's needs.

For instance, the chart below highlights battery options available for a 2010 Chevrolet Equinox V6 AWD. Each option varies in CCA rating, warranty length, and design, giving you a range of choices to suit your specific needs.

Brand Duracell Ultra Platinum Duracell Ultra Gold Duracell Ultra X2Power Optima Yellow Top
Part Number SLI48AGM SLI48H6M SLI48H6 SLI48AGMDP OPT7048-148-ASC
Lead Acid Design AGM Flooded Flooded Premium AGM AGM
CCA 760 730 680 775 800
Warranty 4 Year 3 Year 2 Year 4 Year 3 Year

Each of these batteries meets the manufacturer's minimum CCA requirements, making them excellent replacement options for your vehicle.

For daily drivers, the Duracell Ultra Platinum is an excellent choice, offering a reliable 4-year warranty. If your vehicle has higher power demands—such as heated seats, remote start, or off-road accessories—the X2Power or Optima batteries deliver superior performance with their higher CCA ratings.

A Note About Where You Live

Another important factor to consider is the environment where you'll be driving. Extreme temperatures—whether hot or cold—can significantly impact battery performance. In such conditions, an AGM battery, like the Duracell Ultra Platinum, Optima, or X2Power, is highly recommended. AGM batteries are designed to outperform flooded batteries in nearly every way, especially when exposed to extreme weather.

Batteries Plus is Your Car and Truck Battery Headquarters

Still unsure which car battery is the right fit for your vehicle? Visit your local Batteries Plus, where our expert team is ready to help you find the perfect match for your car or truck. While you're there, be sure to ask about our Premier Installation Service, designed to maximize your battery's lifespan and keep it corrosion-free.

Our Premier Installation Service includes terminal protectors and a terminal protection spray applied before installation. This added layer of care prevents corrosion, ensuring your battery performs at its best for years to come.

FAQs About Car Batteries

Q: How long do car batteries last?

A: Most car batteries last between 3-5 years, depending on driving habits, climate, and maintenance.

Q: What happens if I use the wrong battery?

A: It can lead to poor performance or damage to your vehicle's electrical system.

Q: What's the difference between a flooded and AGM battery?

A: Flooded batteries are traditional, cost-effective options, while AGM batteries offer higher performance, are maintenance-free, and work better in extreme temperatures.

Q: Can I upgrade to an AGM battery if my car originally came with a flooded battery?

A: Yes, upgrading to an AGM battery is fine and often beneficial for vehicles with higher power demands. However, you should not downgrade from AGM to flooded.

Q: Can a car battery with a higher CCA rating damage my car?

A: No, using a battery with a higher CCA rating than required is safe and can provide better starting power, especially in cold weather. Just avoid using a battery with a lower CCA rating than recommended.

Q: What's the best battery for extreme weather?

A: AGM batteries are highly recommended for areas with extreme heat or cold, as they are more durable and perform better in harsh conditions.

Q: How can I keep my battery working in cold weather?

A: Extreme cold can reduce your battery's efficiency and starting power. To protect your battery in winter, park in a garage if possible, ensure it's fully charged, and follow these tips in our blog, How to Protect Your Battery Against Extreme Weather.

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