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What is the difference between a 24F and 27F battery?

The main difference between a 24F and 27F battery lies in their physical size and capacity. Both are lead-acid batteries commonly used in various applications, but they have distinct specifications that make them suitable for different needs.


24F Battery


A 24F battery is a smaller and more compact lead-acid battery, typically measuring around 10 inches long, 6.8 inches wide, and 7.8 inches tall. The "F" in 24F stands for "Flat", indicating that the battery has a flat top design. 24F batteries are known for their relatively low capacity, usually ranging from 50 to 70 amp-hours (Ah). These batteries are commonly used in applications such as motorcycles, ATVs, lawn mowers, and small marine vehicles.,p>

27F Battery


In contrast, a 27F battery is a larger lead-acid battery, measuring around 12.1 inches long, 6.8 inches wide, and 7.8 inches tall. The "F" in 27F also stands for "Flat", similar to the 24F. However, the 27F battery has a higher capacity, typically ranging from 70 to 100 Ah. This increased capacity makes the 27F battery more suitable for larger vehicles, such as cars, trucks, and RVs, as well as for applications that require more power, such as marine equipment and heavy-duty machinery.


Key Differences



  • Size: 24F batteries are smaller and more compact, while 27F batteries are larger in physical dimensions.

  • Capacity: 27F batteries have a higher amp-hour (Ah) rating, providing more power and runtime compared to 24F batteries.

  • Applications: 24F batteries are typically used in smaller vehicles and equipment, while 27F batteries are more suitable for larger vehicles and applications that require more power.


In summary, the primary differences between 24F and 27F batteries lie in their physical size and capacity, which ultimately determine their suitability for different applications. Understanding these distinctions can help you choose the right battery for your specific needs.

What is a 27F battery?


The battery of a larger size is a 27F battery, which is an automotive lead-acid battery. It also has greater capacity and cold-cranking power than the 24F and can be utilized with larger engines and in vehicles with higher electrical requirements.



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. 



Can I mix group 24 and group 27 batteries?


It is not recommended to mix Group 24 and Group 27 batteries in the same system. Different group sizes often have varying capacities, internal resistances, and charge/discharge rates, which can lead to uneven charging, reduced lifespan, and imbalanced performance.



Is a group 27 battery better than a group 24?


If you're looking for a battery that lasts the longest while maintaining long-term performance for years to come, the group 27 battery might be the answer! Most people are aware of the group 24 batteries because these are installed in most cars today. group 24 batteries are not suitable for high current applications.


Kevin's Auto

Kevin Bennett

Company Owner

Kevin Bennet is the founder and owner of Kevin's Autos, a leading automotive service provider in Australia. With a deep commitment to customer satisfaction and years of industry expertise, Kevin uses his blog to answer the most common questions posed by his customers. From maintenance tips to troubleshooting advice, Kevin's articles are designed to empower drivers with the knowledge they need to keep their vehicles running smoothly and safely.