What is the Difference Between Group 31 and Group 24 Batteries? Group 31 and Group 24 batteries differ in size, capacity, and application. Group 31 is larger (13″ L x 6.8″ W x 9.4″ H) with 80-125 Ah capacity, ideal for deep-cycle uses like RVs and marine systems. Group 24 (10.25″ L x 6.8″ W x 8.9″ H) offers 55-85 Ah, commonly used for automotive starting or dual-purpose needs. Always verify physical fit and electrical requirements before swapping.
What Is a Group Size 24 Battery?
How Do Physical Dimensions Compare Between Group 31 and Group 24 Batteries?
Group 31 batteries measure approximately 13 x 6.8 x 9.4 inches (LxWxH), while Group 24 units are smaller at 10.25 x 6.8 x 8.9 inches. The 2.75″ length difference impacts compatibility in battery trays. Group 31’s taller profile accommodates thicker lead plates for enhanced durability in deep-cycle applications.
What Are the Capacity Differences Between These Battery Groups?
- Group 31: 80-125 Ah (20hr rate), 180-220 RC minutes
- Group 24: 55-85 Ah, 120-160 RC minutes
Group 31’s higher amp-hour rating supports sustained energy delivery for trolling motors or off-grid systems. Group 24 balances cranking amps (600-800 CCA) with moderate reserve capacity for hybrid starting/deep-cycle use.
Top 5 best-selling Group 14 batteries under $100
| Product Name | Short Description | Amazon URL |
|---|---|---|
|
Weize YTX14 BS ATV Battery  |
Maintenance-free sealed AGM battery, compatible with various motorcycles and powersports vehicles. | View on Amazon |
|
UPLUS ATV Battery YTX14AH-BS  |
Sealed AGM battery designed for ATVs, UTVs, and motorcycles, offering reliable performance. | View on Amazon |
|
Weize YTX20L-BS High Performance  |
High-performance sealed AGM battery suitable for motorcycles and snowmobiles. | View on Amazon |
|
Mighty Max Battery ML-U1-CCAHR  |
Rechargeable SLA AGM battery with 320 CCA, ideal for various powersport applications. | View on Amazon |
|
Battanux 12N9-BS Motorcycle Battery  |
Sealed SLA/AGM battery for ATVs and motorcycles, maintenance-free with advanced technology. | View on Amazon |
The capacity disparity stems from differences in internal construction. Group 31 batteries contain more lead plates and electrolyte volume, allowing deeper discharges without compromising longevity. This makes them ideal for applications requiring daily 50% depth-of-discharge cycles. Group 24’s compact design prioritizes space efficiency over deep-cycle performance, making it better suited for occasional use scenarios. Temperature also affects capacity – both groups lose about 1% capacity per 1°F below 80°F, but Group 31’s larger mass provides better cold weather performance.
Which Applications Are Best Suited for Each Battery Group?
| Group 31 | Group 24 |
|---|---|
| Marine deep-cycle systems | Passenger vehicle starting |
| RV house batteries | Small boat dual-purpose |
| Solar power storage | UPS backup systems |
How Do Terminal Configurations Differ?
Group 31 typically uses heavy-duty SAE posts (5/16″-3/8″) with optional side terminals. Group 24 often combines top posts (3/8″-5/16″) with side-mount options for automotive compatibility. Marine versions of both groups may include dual terminals (top + side) for flexible wiring configurations.
Terminal design impacts installation ease and current handling capacity. Group 31’s robust terminals support thicker gauge cables needed for high-amperage applications like winches or inverter systems. Some Group 31 batteries feature dual-purpose terminals combining threaded studs and standard posts for marine electronics integration. Group 24’s terminal placement follows automotive standards, with some models offering reverse polarity configurations for specific vehicle layouts. Always verify terminal torque specifications – Group 31 typically requires 8-12 ft-lbs versus Group 24’s 5-8 ft-lbs to prevent damage during installation.
What Are the Cost and Lifespan Comparisons?
- Group 31: $200-$400 (AGM), 4-7 year lifespan
- Group 24: $120-$250 (Flooded), 3-5 year lifespan
AGM variants dominate the Group 31 market due to vibration resistance requirements. Group 24 sees more flooded lead-acid options for cost-sensitive automotive applications.
Can You Use Group 31 as a Group 24 Replacement?
- Measure battery compartment clearance (length critical)
- Verify terminal orientation matches vehicle wiring
- Ensure charging system supports higher capacity
While possible in some trucks/RVs, improper sizing can damage battery trays or cause electrical imbalance. Consult manufacturer specs before upgrading.
What Maintenance Differences Exist Between the Groups?
Group 31 AGM models require zero maintenance, while flooded versions need monthly electrolyte checks. Group 24 batteries often use maintenance-free designs except in commercial applications. Both benefit from quarterly terminal cleaning and voltage monitoring.
How Do Cold Cranking Amps (CCA) Compare?
| Metric | Group 31 | Group 24 |
|---|---|---|
| Typical CCA | 800-1000A | 600-800A |
| CA @ 32°F | 950-1200A | 700-900A |
Group 31’s higher CCA suits diesel engines and cold climates. Group 24 meets most gasoline engine requirements except extreme conditions.
Expert Views
“While Group 31 offers superior capacity, we’re seeing increased demand for lithium-ion alternatives in both groups. The 31’s size accommodates LiFePO4 cells better, often tripling usable capacity at half the weight. Still, lead-acid remains dominant for budget-conscious buyers.”
— Michael Torres, Senior Engineer at Coastal Battery Systems
Conclusion
Group 31 batteries excel in deep-cycle marine/RV applications requiring sustained power, while Group 24 remains the automotive standard. Choose based on physical space, electrical demands, and budget. Always match battery chemistry (flooded/AGM) to your charging system capabilities.
FAQ
- Can I use a Group 24 battery in a Group 31 application?
- Not recommended. Undersizing may cause premature failure from excessive cycling. Upgrade wiring if substituting larger groups.
- Which group works better for solar storage?
- Group 31’s higher cycle life (300+ vs 200 cycles) better handles daily solar discharge. Lithium batteries outperform both for renewable energy systems.
- Are weight differences significant?
- Yes. Group 31 averages 60-75 lbs vs Group 24’s 40-50 lbs. Consider weight distribution in marine applications.