A Group 24 battery is a standardized automotive and deep cycle battery size classified by the Battery Council International (BCI), typically used in cars, RVs, and backup power systems.
Ever wondered why certain batteries are marked with numbers like “Group 24”? These numbers aren’t random—they’re part of a universal sizing standard that determines everything from the battery’s physical dimensions to its terminal placement. Group 24 batteries are widely used due to their balanced size, power capacity, and versatility across various applications.
Whether you’re replacing a car battery, upgrading your RV’s power source, or setting up a reliable backup energy solution for home use, knowing exactly what a Group 24 battery is—and why it matters—can save you time, money, and frustration.
Top Group 24 Batteries to Consider
When shopping for a Group 24 battery, it’s essential to choose one that balances power, durability, and reliability. Here are three highly recommended options:
LiTime 12V 100Ah Group 24 Bluetooth LiFePO4 Battery
Why we picked it: This battery offers up to 15,000 cycles, built-in Bluetooth for real-time monitoring, and a lightweight design that’s 63% lighter than traditional lead-acid batteries, making it ideal for RVs and solar systems.
Redodo 12.8V 100Ah Group 24 LiFePO4 Battery
Why we picked it: Featuring Grade A LiFePO4 cells and an upgraded 100A BMS, this battery ensures powerful energy delivery and comprehensive protection against overcharge, over-discharge, and short circuits.
Power Queen 12V 100Ah LiFePO4 Battery BCI Group 24
Why we picked it: Designed for easy replacement of lead-acid batteries, this LiFePO4 battery offers a 10-year lifespan and is versatile enough for solar energy storage systems and RV camping.
What Does “Group 24” Mean in a Battery?
When someone refers to a Group 24 battery, they’re talking about a specific battery size and configuration standard defined by the Battery Council International (BCI). This designation doesn’t refer to the battery’s chemistry or power output directly—but rather its physical dimensions, terminal placement, and general application use.
Dimensions and Specs
Group 24 batteries typically measure around 10.25 inches in length, 6.8125 inches in width, and 8.875 inches in height. Though slight variances exist across manufacturers, these standard measurements make them interchangeable in many automotive and marine applications.
Key Dimensions:
- Length: 10.25 inches (260 mm)
- Width: 6.8125 inches (173 mm)
- Height: 8.875 inches (225 mm)
They are often available in several sub-groupings such as 24F, 24H, 24R, and 24T, which differ slightly in terminal orientation and height but still fall within the same general category.
Common Applications
Group 24 batteries are frequently used in:
- Passenger cars
- Light trucks
- RVs and motorhomes
- Boats and marine vehicles
- Backup power systems and UPS units
- Small solar and off-grid systems
Compatibility & Replacement
Because of their standard sizing, Group 24 batteries are easy to replace or upgrade. Whether you’re switching to a lithium battery for longer cycle life or sticking with AGM for maintenance-free reliability, you can confidently shop within this group.
Different Types of Group 24 Batteries
Though all Group 24 batteries share the same physical dimensions, they come in different battery chemistries, each suited for specific applications. Choosing the right type can significantly affect your battery’s performance and longevity.
Flooded Lead-Acid (FLA) Batteries
Flooded lead-acid batteries are the most traditional type. They contain a liquid electrolyte that must be checked and topped off regularly.
Pros:
- Affordable
- Widely available
- Good performance in vehicles
Cons:
- Requires regular maintenance
- Prone to spills and corrosion
Best for: Budget-conscious users with traditional vehicles or backup power systems.
Absorbent Glass Mat (AGM) Batteries
AGM batteries are maintenance-free and use a fiberglass mat to absorb the electrolyte. They’re sealed, spill-proof, and perform well under vibration and extreme temperatures.
Pros:
- Maintenance-free
- Long lifespan
- Great for modern vehicles and RVs
Cons:
- Higher upfront cost than flooded batteries
Best for: Start-stop vehicles, RVs, boats, and environments with vibration or temperature extremes.
Lithium Iron Phosphate (LiFePO4) Batteries
These are the newest and most advanced option for Group 24 applications. They are incredibly lightweight, long-lasting, and charge faster than lead-acid batteries.
Pros:
- 10+ year lifespan
- Up to 5,000+ cycles
- Built-in Battery Management System (BMS)
Cons:
- Most expensive type
- Not always plug-and-play with older systems
Best for: Solar setups, high-demand RVs, off-grid living, or anyone seeking a long-term solution.
How to Choose the Right Group 24 Battery for Your Needs
Selecting the right Group 24 battery depends on your specific use case, budget, and performance expectations. Not all Group 24 batteries are created equal—so knowing what to look for can make a big difference.
Identify Your Application
Before buying a battery, define how you’ll use it.
- For Vehicles: Look for a high cold cranking amps (CCA) rating to ensure reliable starts, especially in cold weather.
- For RVs and Boats: Choose deep-cycle or AGM types with higher reserve capacity and vibration resistance.
- For Solar or Backup Systems: Opt for LiFePO4 batteries due to their cycle life and efficiency.
Check Key Specifications
Some vital specs to consider:
- Cold Cranking Amps (CCA): Minimum starting power in cold conditions
- Reserve Capacity (RC): How long the battery can deliver power if the alternator fails
- Amp-Hour (Ah) Rating: Total stored energy available over time
- Voltage Stability: Important for sensitive electronics or solar equipment
Compatibility & Terminal Orientation
Ensure your battery’s terminals match your vehicle or system setup. Group 24 batteries come in variations like:
- 24F: Forward terminals
- 24R: Reverse terminals
- 24H/24T: Taller versions for specific compartments
Always double-check your old battery’s terminal orientation and mounting bracket compatibility.
Group 24 Battery Maintenance Tips for Longer Lifespan
Even though many Group 24 batteries today are marketed as “maintenance-free,” taking proper care of your battery can significantly extend its performance and life expectancy—especially in high-demand or harsh environments.
Regular Visual Inspections
No matter the type, check your battery every few months. Look for:
- Corrosion on terminals
- Swollen or cracked casing
- Dirt, dust, or electrolyte residue
- Loose or damaged cables
A simple inspection helps you catch issues early before they lead to costly failures.
Maintain Proper Charge Levels
Keeping your battery fully charged is essential to avoid sulfation—a condition that reduces battery capacity and life, especially in flooded lead-acid and AGM batteries.
Best practices:
- Use a smart charger when storing the battery
- Avoid deep discharges below 50% for lead-acid types
- For lithium batteries, avoid overcharging beyond 100%
Store in the Right Conditions
Batteries degrade faster in extreme heat or cold. When not in use, store your Group 24 battery in:
- A dry, well-ventilated area
- Temperatures between 40°F and 80°F (4°C to 27°C)
- On a battery mat or shelf—not directly on concrete floors
Keep Terminals Clean and Tight
Use a mixture of baking soda and water to clean corrosion from terminals. Apply a thin coat of dielectric grease to prevent future buildup.
Bonus Tip:
Secure the battery firmly in place to prevent vibration damage—especially in vehicles and boats.
Signs It’s Time to Replace Your Group 24 Battery
Even the best-maintained batteries have a finite lifespan. Knowing the signs of a failing Group 24 battery can save you from unexpected breakdowns or power outages at the worst possible time.
Difficulty Starting Your Vehicle
One of the first red flags is slow or hesitant cranking when starting the engine. This usually points to reduced cold cranking amps (CCA) or internal cell failure. If it starts sluggishly or not at all, the battery may be losing its charge capacity.
Repeated Discharging or Inability to Hold a Charge
If your battery frequently dies—even after full charging—it likely has diminished reserve capacity. This is common in older lead-acid batteries, which suffer from sulfation over time.
Warning signs:
- Battery drains quickly after short use
- Requires frequent jump-starts
- Voltage drops quickly under load
Swelling, Leaking, or Strange Smells
Physical signs of failure include:
- Bulging or swollen casing
- Electrolyte leaks
- Rotten egg smell (sulfur)—a sign of overcharging or internal short
These are serious hazards. If you see any of these signs, replace the battery immediately.
Dashboard Warning Lights or System Errors
Modern vehicles are sensitive to power fluctuations. A failing battery can trigger check engine, battery warning lights, or electrical system errors—even if the vehicle starts.
Age Over 3–5 Years
Most Group 24 batteries last 3 to 5 years, depending on use and maintenance. If your battery is approaching this age, proactively test or replace it to avoid surprise failure.
Conclusion
Understanding what a Group 24 battery is—and how it fits into your specific needs—is key to making a smart, long-term power investment. From their standardized size to the variety of types like AGM, flooded lead-acid, and lithium, these batteries serve a wide range of applications, from vehicles and RVs to solar and backup systems.
By choosing the right battery chemistry, keeping up with regular maintenance, and knowing when to replace it, you can extend the battery’s lifespan and ensure reliable performance. Whether you’re upgrading for more power or simply replacing a worn-out unit, a well-chosen Group 24 battery can provide years of dependable service.
Frequently Asked Questions About Group 24 Batteries
What vehicles use a Group 24 battery?
Group 24 batteries are commonly used in mid-size to large passenger vehicles, trucks, SUVs, RVs, and some boats. They’re often selected for vehicles that require higher cold cranking amps (CCA) and reliable power reserves. Always consult your owner’s manual or existing battery label for compatibility.
What’s the difference between Group 24 and Group 34 batteries?
While both belong to the BCI sizing system, they differ in dimensions and terminal orientation.
- Group 24: Typically taller and slightly narrower
- Group 34: Shorter and wider, often used in performance vehicles
Make sure the replacement fits your battery tray and cable setup.
Can I replace a Group 24 battery with a lithium version?
Yes—many lithium (LiFePO4) batteries are now available in the Group 24 form factor. Just ensure your charging system supports lithium charging profiles, and confirm the battery management system (BMS) is integrated for safety and performance.
How long does a Group 24 battery last?
- Flooded Lead-Acid: 3–4 years
- AGM: 4–6 years
- Lithium (LiFePO4): Up to 10 years or more
Lifespan depends on usage habits, maintenance, and operating conditions.
Do I need a special charger for Group 24 batteries?
Not specifically for the size—but yes, for the chemistry. AGM and lithium batteries require smart chargers that support their charging profiles. Using the wrong charger can reduce lifespan or cause damage.