Group 24 and Group 27 batteries are standardized by the Battery Council International (BCI). Group 24 measures approximately 10.25″ x 6.8″ x 8.9″, while Group 27 is larger at 12.06″ x 6.8″ x 8.9″. Both are 12V batteries, but Group 27 typically offers higher capacity (85-105 Ah) and cold cranking amps (CCA) than Group 24 (70-85 Ah), making them suited for high-demand applications like RVs and marine systems.
What Is a Group Size 24 Battery?
How Do Group 24 and Group 27 Batteries Compare in Physical Dimensions?
Group 24 batteries are compact (10.25″ L x 6.8″ W x 8.9″ H), ideal for vehicles with limited space. Group 27 batteries are longer (12.06″ L) but share the same width and height. The extra length allows Group 27 to house more lead plates, increasing energy storage. Always verify your vehicle’s battery tray size before choosing—larger batteries may not fit smaller compartments.
Installation flexibility varies significantly between the two sizes. While Group 24 fits most compact cars and small marine applications, Group 27 requires 1.8 inches of additional length clearance. This difference impacts compatibility with battery hold-down brackets and cable routing. For example, trucks with oversized engine compartments often accommodate Group 27 without modification, whereas hatchbacks may need tray extenders. Weight differences also matter—Group 27 averages 50-60 lbs compared to Group 24’s 40-50 lbs, affecting vehicles where weight distribution is critical.
Top 5 best-selling Group 14 batteries under $100
| Product Name | Short Description | Amazon URL |
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Weize YTX14 BS ATV Battery  |
Maintenance-free sealed AGM battery, compatible with various motorcycles and powersports vehicles. | View on Amazon |
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UPLUS ATV Battery YTX14AH-BS  |
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Mighty Max Battery ML-U1-CCAHR  |
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Battanux 12N9-BS Motorcycle Battery  |
Sealed SLA/AGM battery for ATVs and motorcycles, maintenance-free with advanced technology. | View on Amazon |
| Dimension | Group 24 | Group 27 |
|---|---|---|
| Length | 10.25″ | 12.06″ |
| Width | 6.8″ | 6.8″ |
| Height | 8.9″ | 8.9″ |
What Are the Capacity Differences Between Group 24 and Group 27 Batteries?
Group 24 batteries average 70-85 Ah (amp-hours) and 600-800 CCA, suitable for standard cars and moderate power needs. Group 27 batteries provide 85-105 Ah and 750-900 CCA, delivering extended runtime for RVs, boats, and off-grid systems. The higher reserve capacity (RC) of Group 27 ensures longer operation of accessories like inverters and lighting without recharging.
What Are the Long-Term Cost Implications of Choosing Group 24 vs. Group 27?
Group 24 batteries cost $100-$150, while Group 27 ranges from $150-$250. Though pricier upfront, Group 27’s extended lifespan (4-6 years vs. 3-5 for Group 24) and reduced replacement frequency offset costs in high-use scenarios. Lithium-ion Group 27 batteries, at $600-$1,000, offer 10+ years of service, making them cost-effective for long-term renewable energy setups.
Total cost of ownership calculations must consider application-specific factors. For marine use, Group 27’s superior vibration resistance reduces maintenance costs over time. Solar installations benefit from Group 27’s deeper discharge cycles, which preserve capacity better than Group 24. However, in applications with infrequent use like seasonal vehicles, Group 24’s lower initial investment might be more economical despite shorter lifespan.
| Cost Factor | Group 24 | Group 27 |
|---|---|---|
| Initial Cost | $100-$150 | $150-$250 |
| Replacement Cycle | 3-5 years | 4-6 years |
| 10-Year Cost (Lead-Acid) | $300-$450 | $300-$500 |
“Choosing between Group 24 and Group 27 hinges on balancing space, power, and budget,” says a marine battery engineer. “Group 27’s larger size isn’t just about capacity—it’s about durability. AGM or lithium Group 27 batteries handle deep discharges better, critical for RVs and boats. Always match the battery to the application’s peak load, not just the label on your old battery.”
FAQ
- Can I Replace a Group 24 Battery with a Group 27?
- Yes, if your battery tray accommodates the larger size and terminals align. Group 27 provides more power but may require bracket adjustments.
- Are Group 24 and Group 27 Batteries the Same Voltage?
- Both are 12V batteries. Differences lie in capacity, physical size, and CCA ratings, not voltage.
- Which Lasts Longer: Group 24 or Group 27?
- Group 27 typically lasts longer due to higher reserve capacity and robust construction, especially in deep-cycle applications.