Short Answer: Group 24 and 27 batteries are not the same size. Group 24 measures approximately 10.25″ L x 6.8″ W x 8.9″ H, while Group 27 is larger at 12″ L x 6.8″ W x 9″ H. The Group 27 also offers higher capacity (85–105 Ah) compared to Group 24 (70–85 Ah). Compatibility depends on physical space and terminal placement.
What Is a Group Size 24 Battery?
How Do Group 24 and 27 Batteries Differ in Physical Dimensions?
Group 24 batteries are smaller, designed for compact spaces in vehicles like sedans or small boats. Group 27 batteries, however, are 1.75 inches longer and slightly taller, making them ideal for RVs, marine applications, or trucks where space allows. Always measure your battery tray before swapping sizes to avoid installation issues.
What Are the Capacity Differences Between Group 24 and 27 Batteries?
Group 27 batteries provide 15–25% more ampere-hour (Ah) capacity than Group 24, ranging from 85–105 Ah versus 70–85 Ah. This makes Group 27 better for prolonged power needs, such as RV appliances or trolling motors. Cold Cranking Amps (CCA) are similar (650–800), but runtime under load favors Group 27.
Top 5 best-selling Group 14 batteries under $100
| Product Name | Short Description | Amazon URL |
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|
Weize YTX14 BS ATV Battery  |
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UPLUS ATV Battery YTX14AH-BS  |
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Battanux 12N9-BS Motorcycle Battery  |
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The increased capacity of Group 27 batteries stems from thicker lead plates and additional electrolyte volume. For example, a Group 27 deep-cycle battery can power a 50W RV refrigerator for 20+ hours versus 14 hours with a Group 24. This difference becomes critical in off-grid scenarios where recharging opportunities are limited. However, the higher mass (55–70 lbs for Group 27 vs. 45–60 lbs for Group 24) requires sturdier mounting systems to prevent vibration damage.
| Specification | Group 24 | Group 27 |
|---|---|---|
| Ah Range | 70–85 | 85–105 |
| Typical CCA | 650–750 | 700–800 |
| Ideal Use Case | Daily commuting | Extended marine use |
What Are the Cost Differences Between Group 24 and 27 Batteries?
Group 27 costs $20–$50 more than Group 24 due to higher material usage. For example, a premium AGM Group 24 costs $200–$250, while Group 27 ranges $220–$300. The investment pays off in long-term applications where extra capacity prevents frequent recharging.
Price variations depend on construction type—flooded lead-acid batteries show the smallest price gap ($15–$25 difference), while lithium-ion versions may differ by $100+ due to cell quantity. Commercial users often prefer Group 27 despite higher upfront costs because its 1,200–1,500 cycle life outperforms Group 24’s 800–1,000 cycles. Fleet managers report 18–24 month replacement intervals for Group 24 versus 24–36 months for Group 27 in similar delivery truck applications.
| Battery Type | Group 24 Price | Group 27 Price |
|---|---|---|
| Flooded | $90–$150 | $110–$180 |
| AGM | $200–$250 | $220–$300 |
| Lithium | $600–$800 | $750–$1,000 |
“Many users assume bigger batteries always mean better performance, but neglecting tray space or terminal orientation can lead to costly errors. Always verify reserve capacity (RC) ratings—Group 27’s 160–190 RC vs. Group 24’s 120–140 RC—to match your energy demands.”
– John Mercer, Lead Engineer at BattPower Solutions
FAQs
- Q: Can a Group 27 battery fit in a Group 24 tray?
- A: Only if the tray is adjustable. Measure clearance (≥0.5″ on all sides) and ensure terminals won’t contact metal parts.
- Q: Do both groups use the same battery chemistry?
- A: Yes—both come in flooded, AGM, or gel types. AGM is preferred for vibration-heavy applications.
- Q: How long do Group 24 vs. 27 batteries last?
- A: 3–5 years for both, but Group 27 may last longer in deep-cycle use due to reduced strain per Ah cycle.