What Is the Difference Between Group 24 and Group 27 RV Batteries?
Group 24 and Group 27 RV batteries differ in size, capacity, weight, and applications. Group 24 is smaller (10.25″ L x 6.8″ W x 8.8″ H) with 70-85 Ah, ideal for lighter use. Group 27 is larger (12″ L x 6.8″ W x 8.8″ H) with 85-105 Ah, offering extended power for larger RVs. Both are 12V deep-cycle, but Group 27 suits energy-intensive needs.
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How Do Group 24 and Group 27 Batteries Compare in Physical Dimensions?
Group 24 measures 10.25 x 6.8125 x 8.875 inches, while Group 27 is larger at 12 x 6.8125 x 8.875 inches. The extra length in Group 27 allows for higher capacity, making it 10-20% heavier (50-60 lbs vs. 40-50 lbs). Ensure your RV’s battery compartment can accommodate the larger size before upgrading.
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Weize YTX14 BS ATV Battery  |
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What Are the Capacity Differences Between Group 24 and Group 27 Batteries?
Group 24 typically provides 70-85 amp-hours (Ah), whereas Group 27 offers 85-105 Ah. This 15-25% increase means Group 27 can power appliances longer—ideal for extended trips. For example, a 100Ah Group 27 battery can run a 10A fridge for 10 hours vs. 8 hours with an 80Ah Group 24.
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| Battery Group | Ah Range | Runtime Example (10A load) |
|---|---|---|
| 24 | 70-85 | 7-8.5 hours |
| 27 | 85-105 | 8.5-10.5 hours |
Extended capacity becomes crucial when powering multiple devices simultaneously. A Group 27 battery can better handle combined loads from refrigerators, LED lighting, and water pumps without excessive voltage drop. For RVers using inverters, the extra 20-30 Ah provides 240-360 more watt-hours of usable energy before reaching 50% discharge levels.
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Which Battery Lasts Longer: Group 24 or Group 27?
Group 27 batteries often last longer due to higher reserve capacity (160-190 minutes vs. 120-140 minutes). They endure more discharge cycles (300-400 vs. 250-350) when maintained properly. AGM variants in both groups outlast flooded lead-acid types, with lifespans up to 7 years vs. 3-5 years.
Can You Replace a Group 24 Battery With a Group 27 in an RV?
Yes, if your RV’s battery tray and wiring harness can fit the larger Group 27. Check compartment dimensions (12″ length required) and terminal positions. Upgrading boosts capacity by 20-30% but may require adjusting hold-down brackets. Consult your RV manual or a technician for compatibility.
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What Are the Cost Differences Between Group 24 and Group 27 Batteries?
Group 27 batteries cost $150-$250, while Group 24 ranges $100-$200. AGM versions add 30-50% to the price. Though pricier, Group 27 delivers better cost-per-Ah—$1.50/Ah vs. $1.75/Ah for Group 24. Budget-conscious RVers can opt for flooded lead-acid Group 27 at $120-$180.
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| Type | Group 24 Price | Group 27 Price |
|---|---|---|
| Flooded Lead-Acid | $100-$150 | $120-$180 |
| AGM | $180-$200 | $220-$250 |
While the upfront cost is higher, Group 27’s extended lifespan often results in lower long-term costs. Over a 5-year period, a $200 Group 27 providing 100 cycles annually costs about $0.40 per cycle, compared to $0.48 per cycle for a $150 Group 24 with reduced cycle life. Consider warranty differences too—many Group 27 batteries offer 36-month coverage versus 24 months for Group 24 models.
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Expert Views
“Upgrading to Group 27 is wise for RVers who dry camp frequently. The 30% capacity gain means fewer generator hours. Just ensure your charging system can handle the larger battery—a 100Ah battery needs at least a 25A charger for optimal performance.”
– John Carter, RV Power Systems Specialist
Conclusion
Group 27 RV batteries outperform Group 24 in capacity and longevity but require more space and budget. Match your choice to energy needs: Group 24 for weekend trips, Group 27 for full-time RVing. Always verify physical compatibility and pair with proper charging infrastructure.
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FAQs
- Can I mix Group 24 and 27 batteries in my RV?
- No. Mixing different group sizes creates imbalances, reducing efficiency and lifespan. Use identical batteries for bank configurations.
- How much heavier is a Group 27 vs Group 24?
- Group 27 weighs 10-15 lbs more—critical for weight-sensitive RVs. A typical Group 24 is 45 lbs vs. Group 27’s 55-60 lbs.
- Do Group 27 batteries charge faster than Group 24?
- No. Larger batteries require longer charge times. A 100Ah Group 27 needs 8-10 hours with a 10A charger vs. 6-8 hours for an 80Ah Group 24.