What is the difference between a 24f and a 35 battery?

The difference between a 24F and a 35 battery mostly comes down to size, capacity, and how well they fit your vehicle. A 24F is generally larger and can offer more reserve power, while a 35 is a common, more compact option used in many passenger cars. The right choice depends on your vehicle’s required group size and terminal layout.

What the numbers mean

Group sizes are standardized by the Battery Council International (BCI). A 24F and a 35 indicate different footprint shapes, mount points, and terminal configurations, which affects fit and installation. The “F” suffix on 24F signals a specific terminal arrangement used by some vehicles and is not interchangeable with every other size. Always verify the exact specifications for your car before purchasing.

Both are typically 12-volt batteries, but the performance specs you care about—such as capacity (Ah), cold-cranking amps (CCA), and reserve capacity (RC)—vary by brand and model. In general, the larger 24F case tends to support higher reserve power and longer RC, while the 35 is a more compact size that fits many mid‑size cars.

To avoid mismatches, consider how the battery will be mounted and how the cables reach the terminals, since terminal layout and hold-down hardware differ between sizes.

Here are the main practical differences to consider:

• Physical fit and dimensions: 24F is typically larger in length and height than 35, affecting whether it physically fits in the battery tray and clearance areas.


• Weight: 24F batteries are generally heavier due to their larger case and higher capacity, influencing handling and installation.


• Electrical capacity: 24F models often offer higher reserve capacity and may carry higher Ah ratings, translating to more sustained power.


• Electrical power for starting: CCA ratings vary by model, but the larger size often provides robust starting power, especially in demanding climates.


• Terminal layout and hold-down: The terminal positions and mounting hardware differ between groups, so cables, clamps, and trays must match the specific size (and the F suffix can indicate a particular layout).

Concluding, the main takeaways are that the 24F is typically the bigger, higher-capacity option with a distinct terminal layout, while the 35 is a smaller, widely used choice that fits many cars. Always confirm the required group size from your vehicle’s manual or labeling on the existing battery, and check the replacement’s CCA/RC/Ah to ensure you meet your climate and starting power needs.

Choosing the right battery for your vehicle

To ensure you get the correct battery, start by verifying your vehicle’s required group size and terminal configuration. Use the owner’s manual or the existing battery as the reference point, and ask a professional if you’re unsure.

Before you buy, compare these key factors:

• Group size compatibility: Confirm the exact group size (24F or 35) recommended for your vehicle.


• Terminal type and polarity: Ensure the terminal layout and polarity match your car’s wiring harness and clamps.


• Cold-cranking amps (CCA) and reserve capacity (RC): Match or exceed your climate and starting power needs.


• Size, weight, and mounting: Check that the battery fits in the tray, with proper clearance for ducts, hold-downs, and cables.


• Warranty and price: Compare brands and warranty terms for longevity and total cost of ownership.

Concluding, the best practice is to choose a battery that matches the factory specifications for your vehicle, or consult a trusted technician to ensure proper fit, performance, and reliability in your climate.

Summary

In brief, 24F and 35 are two common group sizes with distinct physical dimensions, terminal layouts, and capacity profiles. The 24F is typically larger and may offer higher reserve power, while the 35 is a versatile, widely used option for many cars. Always verify the correct group size, read the production specs (CCA, RC, Ah), and ensure proper fit with your vehicle’s mounting and electrical system before purchasing.

What does battery group size 35 mean?

A Group 35 battery is a standard size classification for automotive batteries, characterized by its specific physical dimensions (approx. 9.06×6.88×8.889.06 cross 6.88 cross 8.889.06×6.88×8.88 inches). It is used in a wide range of vehicles, including many Japanese and some American cars, trucks, and SUVs, to provide starting, lighting, and ignition power. 

• Dimensions: The BCI (Battery Council International) group size specifies the battery's length, width, and height, which are approximately 9.069.069.06 inches long, 6.886.886.88 inches wide, and 8.888.888.88 inches high for a Group 35. 
• Vehicle Applications: These batteries are commonly found in vehicles from manufacturers like Toyota, Nissan, Subaru, and Mazda, as well as some older American cars. 
• Variations: Group 35 batteries come in various technologies, including traditional lead-acid and more advanced Absorbent Glass Mat (AGM) types, which offer benefits like maintenance-free operation and enhanced performance for modern vehicles. 
• Specifications: Other key specifications to consider when choosing a Group 35 battery include its Cold Cranking Amps (CCA), reserve capacity, and amp-hour rating, which vary between brands and models. 

What does 24F mean on a car battery?

"24f" on a car battery refers to its BCI group size, which indicates the battery's physical dimensions and terminal placement. The "24" specifies its standardized size and shape (approximately 10.3" L x 6.8" W x 8.9" H), while the "f" signifies that the positive (+) terminal is on the right and the negative (-) terminal is on the left when viewed from the top. This reversed terminal layout is a key difference compared to a standard Group 24 battery. 
Key differences between Group 24 and 24F

• Terminal placement: This is the most critical distinction. 
  • Group 24: Positive (+) on the left, negative (-) on the right. 
  • Group 24F: Positive (+) on the right, negative (-) on the left. 
• Physical fit: Both groups are designed to fit the same battery trays because they share the same standardized dimensions. 
• Vehicle compatibility: The "f" is common in many Asian vehicles, including Acura, Honda, Nissan, and Toyota models. 

What to consider when replacing a 24F battery

• Terminal orientation: Always purchase a battery with the correct terminal orientation (24F) to avoid issues with cable length and strain. 
• Check your owner's manual: The best way to confirm the right group size is to consult your vehicle's owner's manual or look up the correct part number. 
• Compare with the old battery: The group size is usually listed on the old battery. However, be aware that if a previous replacement was incorrect, you might have a mislabeled battery. 
• Use a fitment finder: Most auto parts websites have online tools where you can enter your vehicle's year, make, and model to find the correct battery. 

What is the difference between a 24F and 35 battery?

The main difference is that a Group 24F battery is taller and designed for some Asian vehicles, while a Group 35 battery is shorter and more common for other vehicles. A 24F has dimensions of approximately 10.75×6.8×910.75 cross 6.8 cross 910.75×6.8×9 inches (27.31 x 17.27 x 22.86 cm), while a standard Group 24 is slightly shorter and a Group 35 is shorter and narrower. However, a Group 35 can sometimes be a suitable replacement for a 24F and may have a higher Cold Cranking Amps (CCA) rating, making it better for cold climates.
 

Feature	Group 24F	Group 35
Dimensions	Approximately 10.75 L×6.8 W×9 H10.75 L cross 6.8 W cross 9 H10.75 L×6.8 W×9 H inches (27.31 x 17.27 x 22.86 cm27.31 x 17.27 x 22.86 cm27.31 x 17.27 x 22.86 cm)	Generally shorter and narrower than a 24F
Typical Use	Designed for certain Asian vehicles	A versatile and common option for many vehicles
Best For	Specific vehicles with this fitment	Vehicles needing a shorter battery or in milder climates
CCA	Varies, but a 35 can have higher CCA	Varies, but can be higher than a 24F
Reserve Capacity	Varies by specific battery model	Varies by specific battery model

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Key differences

• Physical size: A Group 24F is taller and has different dimensions than a Group 35. Group 24 is standard length, but 24F has a height of 9 inches and a length of 10.75 inches. 
• Terminal configuration: While the "F" in 24F indicates the terminal layout is designed for specific Asian vehicles, the Group 35 is a more general-purpose size that can sometimes be used to replace a 24F if the physical dimensions are compatible. 
• Cold Cranking Amps (CCA): Despite the size difference, some Group 35 batteries may have a higher CCA rating than some Group 24F batteries. If you live in a cold climate, a battery with a higher CCA rating is more important for reliable starting power. 
• Fitment: Always check the manufacturer's recommendations or consult a professional before replacing a battery, as using the wrong size can cause damage to your car's electrical system. 

Can I use a 35 battery instead of 24?

You can likely use a Group 35 battery instead of a Group 24, as a Group 35 is physically smaller and a common alternative for vehicles that originally used a Group 24. However, you must ensure the new battery has enough cold-cranking amps (CCA), the terminals are correctly oriented to match your car's cables, and the hold-down clamp can secure it properly. 
Before you make the switch

• Check the CCA: Compare the cold-cranking amps of both batteries to ensure the new one meets your car's minimum requirements. A lower CCA might impact starting in cold weather or shorten the battery's life. 
• Verify terminal orientation: Check that the positive and negative terminals are in the correct positions to match your car's battery cables. If they are reversed, the cables may not reach, or worse, connecting them incorrectly can cause serious damage to your car's electronics. 
• Confirm physical fit: A Group 35 battery is slightly shorter than a Group 24, but ensure it fits securely in your battery tray and can be properly clamped down. A loose battery can lead to damage or performance issues. 
• Consult your owner's manual: The safest way to be sure is to check your car's owner's manual or a battery size chart to confirm compatibility.