The Complete Guide to Group 24 Batteries
Group 24 batteries are a type of lead-acid car battery commonly used in large trucks, RVs, farm equipment, and other heavy-duty vehicles. As their name implies, they fit a standard "group size" that has specific dimensions established by the Battery Council International. But what exactly are group 24 batteries, and why are they a popular choice for powering large vehicles? This guide will explore everything you need to know.
Table of Content
What is Group Size?
The group size on a battery refers to its standardized physical dimensions that are assigned by the Battery Council International (BCI). There are several common group size designations for lead-acid automotive starter batteries:
Suggested Reading: Choosing The Right Battery Size For Your RV/Boat
- Group 24 - A large battery commonly used in heavy duty vehicles like trucks. It has dimensions of about 10" x 7" x 9".
- Group 27 - An even larger battery used for commercial vehicles and trucks. Approximately 12" x 7" x 9" in size.
- Group 35 - A mid-sized battery used in many passenger cars. Around 10" x 7" x 7" in dimensions.
- Group 51R - A small battery for compact cars and some motorcycles. Common dimensions of 5" x 5" x 4".
- Group 65 - A large battery used in performance cars, trucks, or diesel vehicles. Approximately 12" x 6" x 9" in size.
The group size allows for standardized trays, clamps, and other accessories to fit a range of batteries from different manufacturers as long as they share the same group size designation.
Knowing the right group size is important when replacing a battery to ensure proper fitment and electrical connections to the vehicle. The group size is usually imprinted on the top or side label of the battery along with other technical specs. Checking your vehicle owner's manual can also confirm the correct group size battery for your make and model.
Basic Information about Traditional Lead Acid Group 24 Battery
Specs and Technical Details
Traditional group 24 lead-acid batteries have the following specifications:
- Voltage: 12V
- Capacity: 50-100 Ah
- Dimensions: 10" x 6 7/8" x 8 15/16"
- Terminal type: SAE / GM posts
- Average weight: 50-60 lbs
The high CCA provides the power to start diesel engines. The size offers capacity to run accessories.
Applications and Vehicle Compatibility
Group 24 batteries are most commonly found in:
- Heavy-duty trucks like semi-trucks and dump trucks
- RV motorhomes
- Buses
- Commercial work vans
- Agricultural equipment Diesel pickup trucks
Advantages of Group 24 Batteries
Group 24 batteries offer numerous advantages for automotive and marine use. They have a higher capacity, allowing for longer run times before needing recharge. Some lead acid group 24 batteries also provide sufficient power output for engine starting efficiency. These batteries are compact and easy to install in tight spaces. They are built to withstand tough environments and extreme temperatures.
Many Group 24 batteries are maintenance-free, eliminating the need for regular upkeep. Moreover, they are easily accessible, making them convenient to replace or upgrade when necessary.
In summary, Group 24 batteries offer a well-rounded combination of power, size, and durability, making them a popular choice for automotive and marine applications.
How to Maintain Lead Acid Group 24 Battery
Maintaining a Group 24 battery is important to ensure its longevity and optimal performance. Here are some tips to help you maintain a Group 24 battery:
Keep it clean
Regularly inspect the battery terminals and cables for any signs of corrosion or buildup. If you notice any, clean them using a mixture of baking soda and water, and a wire brush. Rinse with clean water and dry thoroughly.
Check the electrolyte level
For batteries with removable caps, check the electrolyte level regularly. Ensure the level is above the plates and add distilled water if needed. Do not overfill.
Avoid deep discharges
Group 24 batteries perform best when they are not deeply discharged. Try to keep the battery charged above 50% DOD to increase its lifespan. If the battery discharges frequently, consider using a battery maintainer or charger to keep it topped up.
Charge properly
When charging the battery, make sure to use a compatible charger that matches the battery's voltage and charging requirements. Follow the manufacturer's instructions and avoid overcharging.
Store in a cool, dry place
If you need to store the battery for an extended period, find a cool and dry location. Extreme temperatures can negatively affect the battery's performance and lifespan.
→ Suggested Reading: How To Properly Store Your LiFePO4 lithium Battery
Perform regular inspections
Check the battery for any physical damage, leaks, or signs of wear. If you notice any issues, it may be necessary to replace the battery.
Remember, specific maintenance requirements can vary based on the manufacturer's recommendations and the battery type. Always consult the battery's manual or contact the manufacturer for specific maintenance instructions.
Is There Maintenance-Free and Lighter Group 24 Battery?
Yes! Upgrading your Group 24 battery to lithium is one of the best ways to eliminate the hassle of regular maintenance. Traditional lead-acid batteries require periodic watering, equalization, and corrosion checks—but lithium batteries free you from all that. Explore the LiTime 12V 100Ah Group 24 lithium battery collection to find the perfect fit for your energy needs.
Lithium Group 24 batteries are a smart, modern alternative for anyone seeking a maintenance-free and significantly lighter solution. Compared to traditional Group 24 lead-acid batteries, which typically weigh between 60 to 70 lbs, the LiTime 12V 100Ah Group 24 lithium battery weighs just 21 lbs—making it ideal for RVs, boats, and portable power systems where weight savings matter. Plus, with built-in battery management systems (BMS), LiTime lithium batteries offer enhanced safety, longer lifespan, and better performance in both hot and cold climates.
Deep Cycle Lithium Group 24 with Bluetooth Function
LiTime has newly release the Group 24 Smart Lithium Deep Cycle Battery with Bluetooth and low-temperature charging-off protection.
FAQs about Group 24 Batteries
1. What are the Differences Between a Group 24 and Group 31 Battery?
The main difference between a Group 24 and Group 31 battery lies in their physical size and capacity. Group 24 batteries are generally smaller and have a lower capacity compared to Group 31 batteries.
Group 24 batteries are commonly used in a wide range of applications, including automotive, marine, and recreational vehicles. They have dimensions of approximately 10.25 inches in length, 6.81 inches in width, and 9.43 inches in height. Group 24 batteries typically have a capacity of around 70-85 amp-hours (Ah) and are capable of delivering adequate power for engine starting and auxiliary functions.
On the other hand, Group 31 batteries are larger and have a higher capacity compared to Group 24 batteries. They are commonly used in heavy-duty applications, such as commercial trucks, buses, and other larger vehicles. Group 31 batteries have dimensions of approximately 13 inches in length, 6.75 inches in width, and 9.44 inches in height. They typically have a capacity of 95-125 Ah or more, making them suitable for vehicles that require higher power output and longer running times.
For more details can read on Deep Cycle Group 24 VS Group 31.
2. Are Group 24 the Same as Group 27?
No. The Group 27 battery is significantly larger than the Group 24 cells, but it delivers greater power. If size isn’t a concern, they can be used interchangeably.
For more information on the differences between thses 2 kinds of batteries, click on Group 24 vs. Group 27 Battery to learn more.
3. How Do I Know What Group Size Battery I Need?
If you need to purchase a replacement battery for your vehicle, the first step is determining the proper group size. There are a couple ways to do this:
1. Consult the battery section of your owner's manual. Vehicle manufacturers specify the recommended group size battery in the manual.
2. Inspect your existing battery. The group size designation will be physically stamped or printed in several visible locations on the battery itself. Common spots include the top, side, or terminals.
If neither the owner's manual nor your current battery are available, you may need to conduct further research online using your vehicle make, model, and year. Properly identifying the group size is crucial to ensuring a new battery will correctly fit and function with your specific vehicle's electrical system. Installing the wrong size can lead to connection or clearance issues. So take the time to verify the group before making your purchase.
4. Can I Install a Smaller Battery as a Replacement?
No, it's not recommended to install a battery that is not the correct group size. The connections and trays are designed specifically for group 24 dimensions. Using another size risks damage or electrical issues. Always replace with an identical group 24 battery.
5. How Can I Tell If My Group 24 Battery Needs to Be Replaced?
Signs include cracked or bulging cases, corrosion on the terminals, inability to hold a full charge, or if the vehicle has trouble starting. A load tester or multimeter can also determine if it still has sufficient cranking amps and reserve capacity. Read on How To Tell If A Deep Cycle Battery is Bad for more information.
6. Can I mix different group sizes batteries?
It's not recommended to mix batteries of different group sizes, types, or capacities in the same system. Battery group sizes refer to the physical dimensions and terminal placements, but different group sizes often come with different internal chemistries, capacities, and performance characteristics. Mixing them can lead to imbalanced charging and discharging, reduced overall performance, and even potential safety issues.
For optimal results, always use batteries of the same size, voltage, capacity, and chemistry—ideally from the same brand and production batch. This ensures your system stays balanced and your batteries operate efficiently and safely. If you're considering an upgrade or replacement, it's best to replace all batteries in the bank with matching units to ensure long-term reliability.
Conclusion
New advanced lithium battery technology is raising the bar in some applications. For those seeking maximum power density and lighter weight, a lithium conversion of the group 24 size may provide benefits.
Upgrading to a lithium group 24 replacement could future-proof your heavy duty rig for changing power demands. Lithium represents a long-term investment that may save on battery replacement costs over the life of the vehicle.
