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.

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.

Everything You Need to Know about 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.

However, lithium batteries are gaining popularity due to their benefits, take LiTime 12V Group 24 LiFePO4 lithium battery for example:

• Voltage: 12V
• Capacity: 100 Ah 
• Dimensions: Identical to group 24
• Terminals: Compatible with lead-acid
• Average weight: Only 21 lbs

While lead-acid group 24 batteries are a trusted solution, lithium is an increasingly attractive upgrade for maximum power-to-weight and reduced long term costs.

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. They 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 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% 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! Upgrade your Group 24 battery to lithium is a good way to avoid annoying maintenance.

Lithium Group 24 batteries are an excellent option for those looking for a maintenance-free and lighter alternative. Lithium batteries offer several advantages over traditional lead-acid batteries. They are much lighter in weight, which is beneficial for applications where weight is a concern, such as RVs or boats. The traditional Group 24 weights at 60-70 lbs, while LiTime 12V 100Ah Group 24 weights at only 21 lbs.

Lithium batteries also have a longer lifespan, with many manufacturers offering warranties of 8-10 years or more. High-quality lithium batteries, like LiTime’s lithium batteries lifespans are up to 4000-15000, which implies 10+ lifespan.

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.

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.

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.

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.

 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.

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.