How Do I Know Which Battery Fits My Car?

How Do I Know Which Battery Fits My Car?

Hello, Calgary drivers! Are you in the market for a new car battery but unsure about which one is the right fit for your vehicle? You're not alone. Choosing the correct battery is crucial for ensuring your car runs smoothly, especially during our extreme Calgary winters. In this blog, we'll guide you through the process of selecting the perfect battery for your car, and remember, for all your battery needs, Calgary's own Batteries Store has got you covered.

Understanding Car Batteries

Before diving into the selection process, it's essential to understand the basics of car batteries. They come in various sizes, capacities, and types, each designed to meet specific vehicle requirements. The Calgary climate can be harsh on car batteries, making it all the more important to choose the right one.

What Size Battery Fits My Car?

Step 1: Know Your Vehicle’s Requirements

  • Check Your Owner’s Manual: The first step is to consult your car’s owner’s manual. It usually specifies the battery size that fits your car.
  • Understand Battery Specifications: Pay attention to terms like 'Cold Cranking Amps' (CCA), which is critical in Calgary's cold weather, and 'Reserve Capacity' (RC), which indicates how long the battery can run on its power.

Step 2: Battery Size and Fit

  • Battery Group Size: Batteries are categorized into group sizes based on their length, width, and height. Ensure you know the group size that fits your vehicle’s battery tray.
  • Battery Post Configuration: Check whether the positive and negative posts are on the right side of the battery to fit your vehicle’s cable configuration.

Step 3: Choose the Right Battery Type

  • Conventional Lead-Acid vs. Absorbent Glass Mat (AGM): AGM batteries are generally more durable and better suited for harsh weather conditions, like those in Calgary.
  • Consider Your Driving Habits: If you frequently drive in stop-and-go traffic or have additional power demands (like car accessories), you might need a battery with a higher CCA rating.

Step 4: Purchase and Installation

  • Professional Installation: While some people are comfortable installing a car battery themselves, professional installation is recommended to ensure it’s done correctly and safely.

Maintenance Tips

  • Regular Checks: Especially before winter, check your battery’s health.
  • Keep It Clean: Ensure the battery terminals are free from corrosion.
  • Proper Charging: If your car is idle for long periods, consider a trickle charger to keep the battery charged.

What Is A Battery Group Size?

A battery group size refers to the physical dimensions and terminal placements of a car battery. This standardization allows for the proper fitment of the battery in different vehicles. The Battery Council International (BCI) has created this classification system, which categorizes batteries based on their length, width, and height, as well as the type and position of the terminals (positive and negative).

Understanding battery group size is crucial when selecting a replacement battery for your vehicle for several reasons:

1. Physical Fit

The battery needs to fit securely in the vehicle’s battery tray. A battery that's too large won't fit, and one that's too small may not be securely held in place, leading to potential damage or connection issues.

2. Terminal Position

The position of the terminals (positive and negative) must align with the vehicle’s cable configuration. Incorrect terminal placement can lead to cable strain or improper connections.

3. Power Requirements

Although not directly related to the physical size, batteries in certain group sizes are often designed to meet the electrical demands of the vehicles they fit in. This includes factors like Cold Cranking Amps (CCA) and Reserve Capacity (RC), which are important for performance, especially in extreme weather conditions.

For instance, a vehicle that requires a Group 24 battery would need a replacement battery that not only has the same physical dimensions but also the same terminal configuration as other Group 24 batteries. This ensures a proper fit and appropriate electrical specifications for the vehicle.

It's always recommended to check your vehicle's owner's manual or consult with a professional like Batteries Store to determine the appropriate battery group size for your vehicle. This ensures that you select a battery that fits correctly and meets the power requirements of your car.

Types of Car Battery Designs

Car batteries come in various designs, each with unique features and suited for specific applications. Understanding these different types can help you choose the right battery for your vehicle, especially considering factors like climate, vehicle type, and usage patterns. 

Here are the most common types of car battery designs:

1. Flooded Lead-Acid Batteries

  • Traditional Design: Also known as wet cell batteries, these are the most common and traditional type.
  • Maintenance-Required: Some models require regular topping up with distilled water.
  • Economical: Generally, they are more affordable but might have a shorter lifespan and lower performance in extreme conditions compared to more advanced types.

2. Sealed Lead-Acid Batteries

  • Maintenance-Free: These batteries are sealed and do not require water to be added.
  • Safety and Durability: Reduced risk of acid spillage and generally more robust than traditional flooded batteries.
  • VRLA (Valve-Regulated Lead Acid): A subtype that includes Gel Cells and Absorbent Glass Mat (AGM) batteries.

3. Gel Cell Batteries

  • Gel Electrolyte: The electrolyte is in gel form, making it less prone to leakage.
  • Deep Cycle Capabilities: Excellent for deep discharge applications, but sensitive to high charging voltages.
  • Durability and Safety: More resistant to vibration and safer in terms of acid spillage.

4. Absorbent Glass Mat (AGM) Batteries

  • Advanced Design: The electrolyte is absorbed in glass mats between the lead plates.
  • High Performance: Offers a higher power output, faster recharge rates, and longer life, especially in colder climates.
  • Versatility: Ideal for vehicles with start-stop technology and high electrical demands.

5. Lithium-Ion Batteries

  • High-Energy Density: Commonly used in electric and hybrid vehicles due to their high energy output relative to size and weight.
  • Expensive but Efficient: More costly than lead-acid batteries but offer longer life and better performance.
  • Temperature Sensitivity: Performance can be affected by extreme temperatures.

6. Enhanced Flooded Batteries (EFB)

  • Improved Flooded Batteries: Designed to handle higher cycling demands.
  • Start-Stop Systems: Commonly used in vehicles with start-stop technology.
  • Better Durability: More durable than standard flooded batteries but typically less so than AGM batteries.


Selecting the right battery for your car is crucial for its performance and longevity, especially in Calgary’s challenging climate. By understanding your vehicle's requirements, choosing the appropriate size and type, and opting for professional car battery installation, you can ensure your car is equipped with the best possible battery. And for all your battery needs, remember that Batteries Store in Calgary is your go-to destination.

Drive safe and keep your car running smoothly!