What Battery Does a 2015 Honda Accord Take?

Most 2015 Honda Accord models with the 2.4L four-cylinder use a BCI Group 51R 12‑volt starting battery; V6 models (3.5L) typically use a larger BCI Group 24F battery; the 2015 Accord Hybrid uses a Group 51R AGM (absorbed glass mat) 12‑volt auxiliary battery. These are the common North American fitments, and you can confirm your exact requirement in the owner’s manual, under-hood label, or by VIN with a parts retailer.

Quick Reference by Engine and Trim

The list below maps the 2015 Accord’s engines and trims to the correct battery group size and typical specifications to help you choose a compatible replacement without trial and error.

• 2.4L I4 (LX, Sport, EX, EX-L, most non-hybrid trims): BCI Group 51R, 12V flooded lead-acid; recommended 500–550 CCA; reserve capacity ~70–85 minutes; typical dimensions ~9.4 x 5.1 x 8.9 in (LxWxH).
• 3.5L V6 (EX-L V6, Touring V6): BCI Group 24F, 12V flooded lead-acid; recommended 600–750 CCA; reserve capacity ~100–130 minutes; typical dimensions ~10.3 x 6.8 x 8.9 in.
• Accord Hybrid (HEV, 2.0L): BCI Group 51R, AGM required for the 12V auxiliary battery; recommended 410–500 CCA; AGM chemistry supports hybrid charging profiles and accessory loads.

While premium AGM versions are available for all fitments, AGM is required on the Hybrid and optional (but often beneficial) on non-hybrid models. Always match the BCI group and terminal orientation to ensure proper fit and cable reach.

Why Battery Group Size and Orientation Matter

BCI group sizes define the battery’s footprint, height, and terminal layout. The Accord’s 51R and 24F groups have different case sizes and post positions; using the wrong one can lead to hold-down, cable, or hood-clearance issues. The “R” in 51R indicates reversed terminals compared with a standard 51, which is critical for Honda wiring harness reach and safety.

Recommended CCA and Battery Type

Cold Cranking Amps (CCA) indicate how well the battery can start the car in cold weather. For a 2015 Accord, you’ll be well served by the following ranges, balancing performance and longevity:

• Group 51R (I4, non-hybrid): 500–550 CCA for most climates; higher CCA can be useful in cold regions.
• Group 24F (V6): 600–750 CCA; higher-end options may exceed 750 CCA for severe service.
• Group 51R AGM (Hybrid): 410–500 CCA; AGM construction is designed for hybrid systems and accessory loads.

Standard flooded lead-acid is original equipment on most non-hybrid trims. AGM can offer better vibration resistance and deeper-cycle tolerance, but it’s essential only on the Hybrid, where the charging system expects AGM behavior.

How to Confirm the Correct Battery for Your Car

If your car’s trim history is unclear or you’re seeing conflicting recommendations, use these checks to be certain before you buy:

• Owner’s manual: Lists the BCI group and specifications for your exact model.
• Under-hood label or existing battery: Look for “51R” or “24F” on the case; match terminal orientation.
• VIN lookup: Parts retailers and dealerships can confirm fitment by VIN.
• Measure the tray and hold-down: Ensure the case size and height will fit without interference.
• Consider climate: Choose CCA appropriate to your region, especially if temperatures drop below freezing.

Verifying before purchase helps avoid returns, ensures cables reach properly, and prevents hood or bracket interference after installation.

Notes Specific to the 2015 Accord Hybrid

The Hybrid’s 12V battery powers control modules and accessories; the engine is started via the hybrid system, not by a conventional starter. That difference makes battery chemistry and stability more important.

• Use AGM only for the 12V auxiliary battery to match charging profiles and accessory loads.
• Avoid substituting a standard flooded 51R in the Hybrid; it can shorten battery life and cause system faults.
• If the car sits for long periods, maintain the 12V battery with an AGM-compatible smart charger.

Following these guidelines will preserve hybrid system performance and prevent nuisance warnings related to low 12V voltage.

Replacement Tips and Good Practices

Swapping the battery on a 2015 Accord is straightforward, but a few habits will make the job smoother and protect vehicle electronics.

• Use a memory saver if available to preserve radio presets and window auto-up/down functions.
• Clean terminals and apply dielectric protectant to reduce corrosion.
• Tighten clamps snugly but avoid overtightening; ensure the hold-down secures the case firmly.
• After reconnection, initialize auto windows and sunroof (if equipped) per the owner’s manual.
• Dispose of the old battery responsibly; most retailers provide core recycling.

These steps help ensure reliable starting, stable electrical behavior, and longer battery life after installation.

Summary

A 2015 Honda Accord with the 2.4L engine typically takes a BCI Group 51R 12V battery; V6 models take a Group 24F; and the Accord Hybrid requires a Group 51R AGM auxiliary battery. Match the correct group size and terminal orientation, choose CCA appropriate for your climate, and use AGM specifically on the Hybrid. Confirm fitment via the owner’s manual, VIN, or under-hood labeling before purchasing.

What size battery does a Honda Accord need?

The Honda Accord uses a variety of battery sizes depending on the model year and engine type. Common sizes include Group 51R, 24F, and H6/48. Some older models, especially with 4-cylinder engines, may use Group 51R, while V6 models and newer Accords often utilize Group 24F or H6/48. 
Here’s a more detailed breakdown:

• Group Size 51R: Frequently found in older 4-cylinder Honda Accords. 
• Group Size 24F: Common for V6 models and some 4-cylinder versions. 
• Group Size H6/48: Used in some newer Accords, particularly those with larger engines or requiring higher cold cranking amps. 
• Other sizes: Some models may also use Group 35 or Group 47/H5. 

Factors to consider when choosing a battery:

• Engine size: 4-cylinder engines often have different battery requirements than V6 or turbocharged engines. 
• Model year: Newer Accords may have different battery requirements than older ones due to increased electrical demands. 
• Climate: If you live in a cold climate, a battery with higher cold cranking amps (CCA) may be necessary. 
• Battery type: Flooded lead-acid batteries, Enhanced Flooded Batteries (EFB), and Absorbent Glass Mat (AGM) batteries are available, each with different performance characteristics. 

Recommendation:

• Consult your owner’s manual: The most reliable information about your specific Accord’s battery size and requirements can be found in your vehicle’s owner’s manual. 
• Check the battery itself: The current battery in your Accord will have a label indicating its size and specifications. 
• Use a battery finder: Many online retailers and battery manufacturers offer tools that allow you to enter your vehicle’s information to find the correct battery size, according to OPTIMA Batteries. 

What is the difference between a 35 and 51R battery?

The 51R and 35 car batteries are different sizes and have different cold-cranking amp (CCA) capabilities. The 35 battery is generally larger and has a higher CCA, making it better suited for cold weather starting and potentially longer life. The 51R is often found in smaller engines like four-cylinder Hondas, while the 35 is common in six-cylinder models and can be used as an upgrade for some four-cylinder cars. 
Here’s a more detailed comparison:

• Size: The Group 35 battery is larger than the Group 51R. The 35 measures approximately 230mm x 175mm x 225mm, while the 51R is about 238mm x 129mm x 223mm. 
• CCA (Cold Cranking Amps): The 35 battery generally offers more cold-cranking amps, meaning it can provide more power to start the engine in cold weather. 
• Application: The 51R is often found in four-cylinder Hondas, while the 35 is a standard size for many six-cylinder cars and can be used as an upgrade for some four-cylinder models. 
• Fitment: While the 51R and 35 batteries can be physically different sizes, it’s sometimes possible to use a Group 35 battery in place of a 51R if the battery tray and hold-down mechanisms can accommodate the larger size. 

Upgrading from 51R to 35:
If you’re considering upgrading from a 51R to a 35 battery, it’s crucial to check if the battery tray and hold-down hardware can accommodate the larger size. Ensure the cables can reach the terminals without being stretched. A larger battery generally means more reserve capacity and potentially longer life. 
Key Considerations:

• Compatibility: Always verify the dimensions and terminal positions of the batteries to ensure they are compatible with your vehicle’s battery tray and cables. 
• Cold Weather Performance: If you live in a cold climate, a battery with a higher CCA, like the Group 35, might be beneficial. 
• Battery Type: Consider upgrading to an AGM (Absorbent Glass Mat) battery for potentially longer life and better performance. 

What battery does a 2015 Honda Accord need?

Duralast Group Size 51R Battery 51R-DL.

How much is a battery for a 2015 Honda?

How much to replace the battery in my Honda? Depending on power, size, and quality, prices for a replacement car battery range from about $45 to $250.