Group 27 deep cycle batteries are popular for their balance of capacity (80-110 Ah), durability, and versatility in marine, RV, and solar applications. They provide consistent power output, withstand frequent discharges, and come in AGM, flooded, or lithium variants. Their compact size (12.4 x 6.8 x 9.4 inches) and terminal flexibility make them adaptable for diverse energy needs.
What Is a Group Size 24 Battery?
How Do Group 27 Batteries Compare to Other Group Sizes?
Group 27 batteries offer higher capacity than Group 24 (70-85 Ah) and Group 31 (100-125 Ah) while maintaining a mid-sized footprint. They strike a balance between runtime and physical dimensions, making them ideal for moderate energy demands. Unlike starting batteries, deep cycle variants prioritize sustained discharge over short bursts, ensuring longevity in renewable energy or off-grid setups.
| Group Size | Capacity (Ah) | Typical Weight | Common Uses |
|---|---|---|---|
| 24 | 70-85 | 40-55 lbs | Small RVs, backup power |
| 27 | 90-110 | 50-70 lbs | Marine trolling, solar storage |
| 31 | 100-125 | 60-75 lbs | Large RVs, industrial equipment |
This intermediate sizing allows Group 27 batteries to fit spaces designed for smaller units while delivering near-Group 31 performance. Their 20-hour discharge rate makes them particularly effective for applications requiring steady power over extended periods, such as overnight RV refrigeration or continuous solar load support. The terminal configuration also offers compatibility with both automotive-style clamps and marine-grade connectors.
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 |
Why Are Lithium Group 27 Batteries Gaining Popularity?
Lithium variants provide 2-3x more usable capacity than AGM, 80% lighter weight, and 3,000+ cycle lifespans. They charge 5x faster, operate efficiently in extreme temperatures (-20°C to 60°C), and require zero maintenance. Though 2-3x pricier upfront, their total cost per cycle often undercuts lead-acid alternatives.
| Feature | AGM | Flooded | Lithium |
|---|---|---|---|
| Cycle Life | 500-800 | 300-500 | 3,000+ |
| Weight | 60 lbs | 65 lbs | 28 lbs |
| Depth of Discharge | 50% | 30% | 80% |
Advanced lithium models now incorporate self-heating capabilities for sub-zero operation and Bluetooth monitoring for real-time state-of-charge tracking. These innovations make them indispensable for overlanding vehicles and sailboats where weight savings directly translate to improved fuel efficiency or sailing performance. The elimination of maintenance tasks like watering terminals appeals to users seeking plug-and-play solutions.
“The latest Group 27 lithium batteries are revolutionizing off-grid power. We’re seeing 200Ah models in the same footprint using LiFePO4 chemistry, delivering 10-year lifespans with proper cycling. For marine applications, their resistance to sulfation and ability to handle partial state-of-charge makes them a game-changer.”
— Marine Energy Systems Specialist, BatteryTech Innovations
FAQs
- Q: Can Group 27 batteries be used as starting batteries?
- A: While possible, deep cycle batteries prioritize sustained energy delivery over cold cranking amps (CCA). Use dual-purpose batteries if combining starting and deep cycling needs.
- Q: How long do Group 27 batteries last on a single charge?
- A: A 100Ah battery running a 10A load lasts ~10 hours to 50% discharge. Actual runtime depends on temperature, age, and discharge rate.
- Q: Are Group 27 and 27F batteries interchangeable?
- A: Yes, but check terminal positions – Group 27 uses top posts, while 27F may have side terminals. Verify compatibility with your equipment’s cable setup.