A BCI Battery Group Size Reference Chart helps you quickly identify the correct battery size that fits your vehicle based on dimensions, terminal locations, and performance needs.
Ever tried replacing a car battery only to realize it doesn’t fit in the tray or the terminals are in the wrong place? That’s exactly the kind of hassle the Battery Council International (BCI) Group Size chart helps you avoid. This standardized system organizes batteries by physical size, terminal type, and configuration to ensure compatibility with your car, truck, SUV, or even RV.
Whether you’re driving a compact car that needs a Group 51R or a full-size truck that requires a Group 94R, using the correct group size ensures safety, proper fit, and optimal performance. The BCI system removes the guesswork and makes selecting the right battery simple and reliable
Best Batteries by BCI Group Size
Choosing the right battery starts with knowing the BCI group size for your vehicle. Here are three top-rated battery options—each representing a popular group size category: compact, mid-size, and heavy-duty.
Group 51R – Optima RedTop 8020-164 Starting Battery
Why we picked it: Compact and reliable, the Optima RedTop 51R fits many Honda, Toyota, and Nissan models. It provides strong cranking power and fast startups, even in cold weather.
Group 48- Interstate MTX-48/H6
Ideal for many European and domestic vehicles, this battery delivers high reserve capacity and supports start-stop technology. It’s also maintenance-free and built to last.
Group 94R – Odyssey 94R-850 Performance Battery
Why we picked it: Designed for trucks and high-performance SUVs, this battery offers 850 cold-cranking amps, extreme durability, and faster recharging than conventional lead-acid batteries.
These recommendations ensure you’re not just getting the right size, but also high-quality performance and longevity. Matching a trusted brand with the right group size will keep your vehicle running smoothly for years.
What Is BCI Battery Group Size?
BCI battery group size refers to a standardized system developed by the Battery Council International (BCI). It classifies batteries based on their physical dimensions, terminal locations, and type, helping consumers and mechanics choose the correct battery for their vehicles.
Each group size—like Group 24F, Group 35, or Group 94R—corresponds to a specific combination of:
- Length, width, and height
- Terminal layout (left or right positive)
- Polarity and mounting configuration
This classification ensures that the battery will fit securely in the tray, align with terminal connectors, and provide the required starting power. It’s especially important for modern vehicles with tight engine compartments and electronics that rely on exact battery specs.
Why It Matters
Using the wrong battery size can cause several problems:
- Improper fit may damage terminals or wires.
- Incompatible batteries may not deliver the required cold-cranking amps (CCA).
- Battery movement due to loose fitting can cause vibration damage or short circuits.
Where You’ll Find It
You’ll often find the BCI group size:
- Printed on your existing battery label.
- In your owner’s manual under battery specifications.
- Through online fitment tools on battery retail sites.
Whether you’re a DIYer or a pro mechanic, knowing the right BCI group size eliminates guesswork and ensures a safer, smoother installation. It’s not just about “will it work?”—it’s about “will it work right?”
How to Read and Use a BCI Battery Group Size Chart
A BCI battery group size chart lists battery groups by number, alongside key details like dimensions, terminal orientation, and typical applications. Understanding how to use this chart makes battery replacement faster, easier, and more accurate.
Step 1: Identify Your Vehicle’s Required Group Size
First, check your vehicle owner’s manual or inspect the label on your current battery. It’ll often say something like “Group 48” or “Group 35.” This is your BCI group size.
Alternatively, you can use online fitment tools from trusted retailers. Just enter your vehicle make, model, and year—the tool will suggest the correct group size.
Step 2: Consult the BCI Chart
In the chart, you’ll see:
- Group Number (e.g., 24F, 51R, 94R)
- Dimensions (length x width x height in inches or millimeters)
- Terminal Location (left or right positive terminal)
- Typical Applications (vehicle types)
Example from a BCI Chart
| Group Size | Dimensions (in) | Terminal Position | Common Use |
| 24F | 10.25 x 6.8125 x 9 | Left Positive | Honda, Toyota |
| 35 | 9.0625 x 6.875 x 8.875 | Right Positive | Nissan, Subaru |
| 94R | 12.4 x 6.9 x 7.5 | Right Positive | BMW, Mercedes |
Step 3: Match Size + Specs
Once you know your group size, shop for batteries in that category. Double-check dimensions and specs to make sure the battery fits snugly and meets performance requirements.
Popular BCI Battery Group Sizes and Their Applications
While there are over 70 different BCI battery group sizes, only a handful are commonly used in passenger vehicles. Understanding these popular sizes and their applications helps you select a battery that fits and performs well.
Group 24F
- Dimensions: 10.25 x 6.8125 x 9 inches
- Terminal Position: Left positive
- Commonly Found In: Toyota Camry, Honda Accord, Lexus ES
- Why it’s popular: Group 24F is widely used in Asian vehicles. It offers a good balance between size, power, and affordability.
Group 35
- Dimensions: 9.0625 x 6.875 x 8.875 inches
- Terminal Position: Right positive
- Commonly Found In: Subaru Outback, Nissan Altima, Honda CR-V
- Why it’s popular: Compact and versatile, this group is used in many small to mid-size cars and SUVs.
Group 51R
- Dimensions: 9.374 x 5.0625 x 8.8125 inches
- Terminal Position: Right positive
- Commonly Found In: Honda Civic, Fit, Insight
- Why it’s popular: Perfect for compact vehicles with limited battery space.
Group 48 (H6/L3)
- Dimensions: 12.0625 x 6.875 x 7.5625 inches
- Terminal Position: Right positive
- Commonly Found In: BMW 3 Series, Chevrolet Equinox, Ford Edge
- Why it’s popular: Offers excellent reserve capacity and supports modern electrical loads.
Group 94R (H7/L4)
- Dimensions: 12.4 x 6.9 x 7.5 inches
- Terminal Position: Right positive
- Commonly Found In: Mercedes-Benz, Audi, Dodge Ram
- Why it’s popular: Ideal for performance vehicles, luxury cars, and heavy-duty trucks.
How to Choose the Right Battery for Your Vehicle Using Group Size
Knowing your BCI group size is a good starting point—but there’s more to choosing the right battery than just matching the dimensions. Here’s a simple guide to ensure you pick the best battery for performance, fit, and longevity.
Confirm the BCI Group Size
Always begin by verifying the exact group size needed for your car:
- Look in your owner’s manual
- Check your existing battery label
- Use online battery finder tools
Getting the size wrong can lead to poor terminal connections, battery movement, or underperformance.
Match Cold Cranking Amps (CCA)
CCA refers to the battery’s ability to start an engine in cold temperatures. The colder the climate, the more CCA you need.
- Compact sedans: ~400–600 CCA
- SUVs and trucks: ~650–850 CCA
- Diesel engines: Often 900+ CCA
Choose a battery that meets or exceeds the manufacturer’s CCA rating.
Consider Battery Type
There are three main types of automotive batteries:
- Flooded Lead-Acid (FLA): Affordable, but requires maintenance.
- Absorbent Glass Mat (AGM): Higher performance, maintenance-free.
- Enhanced Flooded Battery (EFB): Common in vehicles with start-stop systems.
Use AGM if your vehicle requires it—especially for luxury cars or those with advanced electrical systems.
Look for Trusted Brands
Choose reputable brands like:
- DieHard
- Odyssey
- Optima
- ACDelco
- Interstate
These brands often come with longer warranties and better build quality.
BCI Battery Group Size Chart: Complete Reference Table
The BCI battery group size chart is a trusted reference tool that lists battery groups alongside their dimensions, terminal positions, and typical uses. It helps ensure proper battery fitment, performance, and safety.
Below is a simplified version of the most commonly used group sizes:
| Group Size | Dimensions (inches) | Terminal Position | Common Vehicle Applications | Recommended Battery |
| 24F | 10.25 x 6.81 x 9.00 | Left Positive | Toyota Camry, Honda Accord | DieHard Gold 24F |
| 35 | 9.06 x 6.88 x 8.88 | Right Positive | Nissan Altima, Subaru Forester | Odyssey ODX-AGM35 |
| 51R | 9.37 x 5.06 x 8.81 | Right Positive | Honda Civic, Honda Fit | ACDelco 51RAGM |
| 48 (H6/L3) | 12.06 x 6.88 x 7.56 | Right Positive | Ford Explorer, Chevrolet Traverse | Interstate MTX-48/H6 |
| 94R (H7/L4) | 12.40 x 6.90 x 7.50 | Right Positive | BMW 5 Series, Mercedes E-Class | Optima H7 YellowTop |
| 65 | 12.06 x 7.50 x 7.56 | Left Positive | Ford F-150, Lincoln Aviator | NAPA Legend 7565 |
| 34 | 10.25 x 6.81 x 7.88 | Left Positive | Jeep Liberty, Chevrolet Uplander | Odyssey 34-PC1500T |
| 86 | 9.06 x 6.88 x 8.13 | Top Post | Jeep Patriot, Chevy Aveo | Delphi BU9065 MaxStart |
Tip: Always cross-reference your vehicle’s owner manual with this chart before making a purchase.
This chart ensures you’re not just guessing—but making a decision backed by accurate fitment data.
Conclusion
Choosing the right battery doesn’t have to be complicated. The BCI Battery Group Size Reference Chart simplifies the process by providing a standardized system to match batteries with your vehicle’s specifications. Whether you drive a compact sedan, a rugged SUV, or a heavy-duty truck, selecting the correct group size ensures a secure fit, proper terminal alignment, and the power your engine needs.
Before buying, always verify your vehicle’s group size using the owner’s manual or existing battery label. From there, consult a reliable chart, consider the battery type and CCA, and stick with reputable brands.
A well-matched battery means fewer installation issues, longer lifespan, and better overall performance—no guesswork required.
Frequently Asked Questions About BCI Battery Group Size
What is the BCI battery group size?
The BCI (Battery Council International) battery group size is a standardized number that defines a battery’s dimensions, terminal layout, and application. It ensures that a replacement battery fits your vehicle properly and meets its performance needs.
How do I find the correct BCI battery group size for my vehicle?
To determine the correct group size:
- Check your vehicle’s owner manual—it usually lists the recommended battery size.
- Inspect the current battery—the label should have the group size.
- Use online tools on battery retailer websites, where you can enter your vehicle details (make, model, year) to find the right fit.
Can I use a battery with a different group size?
It’s best to stick to the recommended group size for optimal performance. Using the wrong size can lead to:
- Terminal misalignment
- Poor fitment
- Reduced battery life
If a different group size is necessary due to availability, ensure the battery meets your vehicle’s power requirements (e.g., Cold Cranking Amps, capacity).
What is the Cold Cranking Amp (CCA) rating?
The Cold Cranking Amp (CCA) measures the battery’s ability to start an engine in cold temperatures. A higher CCA rating is ideal for cold climates and larger vehicles. Always choose a battery with equal or greater CCA than what is recommended by the manufacturer.
Why should I choose a reputable battery brand?
Trusted brands like Optima, ACDelco, and Interstate offer superior quality, warranty coverage, and reliability. Reputable batteries tend to have longer lifespans and are less likely to fail prematurely, making them a better investment in the long run.