A Group 27 battery is a lead-acid or lithium-ion power source measuring approximately 12.4 x 6.8 x 9.3 inches. It delivers 66-115 Ah capacity and 600-1,000 CCA, making it ideal for marine, RV, and solar applications. Key specifications include terminal type (top/post), weight (45-70 lbs), and voltage (12V). Always verify dimensions and specs for compatibility with your equipment.
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What Defines a Group 27 Battery?
A Group 27 battery is categorized by its BCI (Battery Council International) size code, indicating standardized dimensions of 12.4″ (L) x 6.8″ (W) x 9.3″ (H). This classification ensures cross-brand compatibility for vehicles requiring this form factor. While physical size remains consistent, technical specifications like chemistry (flooded/AGM/lithium) and capacity vary between manufacturers.
The BCI grouping system helps consumers identify batteries that physically fit their equipment while allowing manufacturers flexibility in performance characteristics. Group 27’s dimensions make it particularly suitable for applications requiring substantial energy storage without excessive footprint. Recent advancements include hybrid designs combining starting and deep-cycle capabilities, with some models featuring dual terminal configurations (top-post and side-post) for installation flexibility. Users should note that while length and width are strictly defined, some manufacturers may add 0.1-0.3 inches in height for additional plate stacks or cooling features.
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  |
Sealed AGM battery designed for ATVs, UTVs, and motorcycles, offering reliable performance. | View on Amazon |
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Weize YTX20L-BS High Performance  |
High-performance sealed AGM battery suitable for motorcycles and snowmobiles. | View on Amazon |
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Mighty Max Battery ML-U1-CCAHR  |
Rechargeable SLA AGM battery with 320 CCA, ideal for various powersport applications. | View on Amazon |
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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 |
What Are the Key Specifications of Group 27 Batteries?
Group 27 batteries feature:
- Voltage: 12V (standard)
- Capacity: 66-115 Ah (lead-acid) / 100-200+ Ah (lithium)
- CCA: 600-1,000A (cold cranking amps)
- Terminals: Dual top-post (SAE) or side-post configurations
- Weight: 45-70 lbs (lead-acid) / 25-40 lbs (lithium)
How Does Group 27 Compare to Other Battery Sizes?
| Group Size | Dimensions (LxWxH) | Typical Ah |
|---|---|---|
| 24 | 10.3″x6.8″x8.9″ | 55-85 |
| 27 | 12.4″x6.8″x9.3″ | 66-115 |
| 31 | 13″x6.8″x9.4″ | 75-125 |
What Applications Are Best Suited for Group 27 Batteries?
Group 27 batteries excel in:
- Marine: Engine starting and house banks
- RV: House batteries for appliances
- Solar: Off-grid energy storage
- Commercial: Backup power systems
- Heavy-duty trucks: Auxiliary power units
How to Maintain a Group 27 Battery?
- Check electrolyte levels monthly (flooded types)
- Keep terminals clean with baking soda solution
- Store at 50% charge if unused
- Use compatible smart charger
- Monitor voltage (12.6V+ when charged)
What Factors Affect Group 27 Battery Lifespan?
Cycle life depends on:
- Depth of discharge (50% recommended for lead-acid)
- Temperature extremes (ideal range: 50-85°F)
- Charging practices (avoid over/under-charging)
- Vibration protection (critical in marine/RV use)
How Does Temperature Impact Group 27 Performance?
High temperatures accelerate corrosion (reduce life by 50% at 95°F vs 77°F). Cold reduces capacity (40% at 0°F). Lithium-ion handles -4°F to 140°F better than lead-acid. Use insulation kits in extreme climates.
Thermal management is crucial for optimizing performance. Lead-acid batteries experience increased internal resistance below freezing, requiring thicker plates to maintain CCA ratings. Conversely, lithium batteries utilize chemical additives to prevent electrolyte freezing. In hot environments, AGM batteries outperform flooded types due to sealed construction reducing water loss. Recent innovations include temperature-compensated charging systems that adjust voltage based on ambient readings, prolonging service life by preventing thermal runaway. For winter storage, maintain batteries above 20% charge to avoid electrolyte freezing points (-92°F for fully charged vs -17°F at 40% charge).
“Modern Group 27 batteries now incorporate carbon-enhanced lead plates and graphene additives, boosting cycle life by 30% compared to 2015 models. However, many users still undercharge them – maintaining at least 80% SoC (State of Charge) doubles service life in deep-cycle applications.” – Industrial Energy Systems Specialist
FAQs
- Q: Can a Group 27 battery fit in a Group 24 tray?
- A: No – Group 27 is 2.1″ longer than Group 24. Modifications required.
- Q: How long do lithium Group 27 batteries last?
- A: 3,000-5,000 cycles vs 400-600 for lead-acid.
- Q: Are all Group 27 batteries dual-purpose?
- A: No – check manufacturer specs for cranking vs deep-cycle designation.