Group 31 and Group 24 batteries differ in size, capacity, and application. Group 31 is larger, with higher cold cranking amps (CCA) and amp-hour (Ah) ratings, making it ideal for heavy-duty vehicles, marine use, and renewable energy systems. Group 24 is smaller, suited for standard cars and light trucks. Compatibility depends on physical dimensions and terminal configuration.
What Is a Group Size 24 Battery?
How Do Group 31 and Group 24 Batteries Compare in Size?
Group 31 batteries measure approximately 13 x 6.8 x 9.4 inches, while Group 24 batteries are smaller at 10.25 x 6.8 x 8.9 inches. The larger size of Group 31 allows for more lead plates, increasing capacity and weight (60–70 lbs vs. 40–50 lbs for Group 24). Ensure your vehicle’s battery tray and hold-down brackets match the dimensions before swapping.
The size difference directly impacts installation flexibility. Group 24’s compact design fits standard automotive battery trays without modification, making it a popular choice for factory installations. In contrast, Group 31 requires vehicles with reinforced trays due to its extra weight and bulk. Commercial trucks often feature purpose-built compartments for Group 31 batteries, while marine applications may use customized battery boxes. When retrofitting, measure not just the tray length and width but also vertical clearance – some Group 31 batteries have taller cases that might interfere with hoods or other engine components.
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 |
| Dimension | Group 31 | Group 24 |
|---|---|---|
| Length (inches) | 13 | 10.25 |
| Width (inches) | 6.8 | 6.8 |
| Height (inches) | 9.4 | 8.9 |
Which Battery Offers Higher Cold Cranking Amps (CCA)?
Group 31 batteries typically deliver 800–1000 CCA, outperforming Group 24’s 600–800 CCA range. This makes Group 31 better for diesel engines, RVs, and cold climates where reliable starting power is critical. For example, a Group 31 battery can sustain heavy electrical loads in commercial trucks, while Group 24 suits gasoline engines with moderate power needs.
The CCA advantage becomes crucial in extreme conditions. At -18°C (0°F), Group 31’s higher CCA rating ensures sufficient power to crank stiff engines, especially in diesel vehicles with higher compression ratios. This performance comes from thicker lead plates and optimized electrolyte composition. However, excessive CCA in smaller vehicles can be wasteful – a compact car with 600 CCA requirements gains no benefit from a 1000 CCA battery. Always match CCA ratings to manufacturer specifications to avoid overpaying for unnecessary capacity while ensuring reliable starts in your climate zone.
Where Are Group 31 Batteries Most Commonly Used?
Group 31 batteries dominate heavy-duty applications: commercial trucks, marine vessels, RVs, and off-grid solar systems. Their robust design handles deep cycling and vibration. For example, diesel-powered construction equipment often uses Group 31 AGM batteries for durability, while sailboats rely on them for windlass and navigation systems.
These batteries excel in dual-purpose roles combining starting and deep-cycle functions. Over-the-road trucks use them for both engine cranking and powering sleeper cab amenities. In marine environments, Group 31’s corrosion-resistant terminals and spill-proof designs prevent acid leaks during rough seas. Renewable energy installations benefit from their ability to withstand daily charge/discharge cycles – a quality tested in solar farms where batteries may cycle to 50% depth of discharge daily for years. Their thick plates also resist sulfation better than smaller batteries during periods of partial charge.
“Group 31 batteries are the workhorses of industrial applications. Their design prioritizes endurance over compactness—perfect for dual-battery setups in overlanding rigs. However, consumers often overestimate their needs. A Group 24 AGM suffices for most daily drivers, offering 4–5 years of reliable service without the bulk.”
FAQ
- How Long Do Group 31 Batteries Last?
- Group 31 batteries last 4–7 years with proper maintenance. Deep-cycle variants endure 500–1000 cycles at 50% depth of discharge. Regular voltage checks and avoiding over-discharge extend lifespan.
- Is Group 31 Better for Solar Power Storage?
- Yes. Their high Ah capacity and deep-cycle design make Group 31 ideal for solar systems. Pair two in series for 24V setups, common in off-grid cabins.
- Can I Use a Group 24 Battery in a Boat?
- Only for starting engines in small boats. For trolling motors or house banks, upgrade to Group 31 deep-cycle batteries to prevent premature failure from sustained loads.
Choosing between Group 31 and Group 24 hinges on your vehicle’s requirements and usage patterns. Group 31 excels in demanding environments, while Group 24 strikes a balance for everyday use. Always verify physical compatibility and consult technical specs to optimize performance and longevity.