Published on: April 27, 2023
Written by Jonas Frank / Fact-checked by Nova Scarlett
A Group 27 deep cycle battery is a specific category of rechargeable batteries that provide long-lasting power for a wide range of applications. With a higher capacity and more durable design, these batteries are ideal for sustained energy output rather than short bursts, as with typical starter batteries.
Applications and Importance
From recreational vehicles (RVs) and marine applications to solar power systems and backup power supplies, Group 27 deep cycle batteries offer reliable and consistent power solutions. In this guide, we’ll explore the ins and outs of these versatile batteries to help you make an informed decision for your energy needs.
Basics of Deep Cycle Batteries
What is a Deep Cycle Battery?
Deep cycle batteries are designed to deliver a steady flow of power over an extended period, with the ability to be discharged and recharged repeatedly. They are often used in applications that require a consistent power supply, such as off-grid solar systems, RVs, and boats.
Key Differences Between Deep Cycle and Starter Batteries
While starter batteries are designed to provide a high current for short periods, deep cycle batteries excel at providing a stable power source over time. The key differences between these two battery types lie in their plate composition, design, and intended use.
How a Deep Cycle Battery Works
A deep cycle battery stores energy through an electrochemical process involving lead plates and an electrolyte solution. The energy is released as electrons flow through a connected load, and the battery can be recharged by reversing the electrochemical process.
Anatomy of a Group 27 Deep Cycle Battery
Battery Capacity: Ampere-Hours (Ah)
Battery capacity, expressed in ampere-hours (Ah), represents the amount of energy a battery can store. A Group 27 deep cycle battery typically has a capacity between 80 and 100 Ah, depending on the specific model and chemistry.
Dimensions and Weight
Group 27 batteries are standardized in size, with dimensions of approximately 12.1 inches in length, 6.8 inches in width, and 8.9 inches in height. The weight of these batteries can vary depending on the type, ranging from 50 to 70 pounds.
Terminal Types
Group 27 deep cycle batteries come with various terminal types, including automotive post, threaded stud, and marine terminals. The terminal type determines the compatibility and ease of connection with your desired application.
Types of Group 27 Deep Cycle Batteries
Flooded Lead-Acid (FLA)
FLA batteries are the most common type of deep cycle batteries, featuring an electrolyte solution that floods the lead plates. They are affordable and reliable but require regular maintenance to ensure optimal performance.
Absorbent Glass Mat (AGM)
AGM batteries use a glass fiber mat to absorb the electrolyte, making them virtually maintenance-free. They offer a higher energy density and faster charging rates than FLA batteries but come with a higher price tag.
Gel Batteries
Gel batteries feature a silica-based gel electrolyte that reduces the risk of leaks and enhances resistance to vibration and shock. They are ideal for high-heat environments but can be more expensive than FLA and AGM batteries.
Lithium-Ion (Li-ion)
Li-ion batteries are lightweight, compact, and offer a high energy density with a longer lifespan compared to other Group 27 battery types. However, they also come with a higher upfront cost.
Selecting the Right Group 27 Deep Cycle Battery
Factors to Consider
When selecting the right Group 27 deep cycle battery, consider factors such as your intended application, budget, maintenance preferences, and specific performance requirements.
Understanding Battery Specifications
Pay close attention to the battery’s specifications, including capacity (Ah), reserve capacity (RC), cold cranking amps (CCA), and cycle life. These factors will help you determine if a particular battery will meet your needs.
Battery Life Expectancy
The life expectancy of a Group 27 deep cycle battery can vary based on factors such as usage, maintenance, and environmental conditions. Generally, FLA and AGM batteries last 3-5 years, while gel and Li-ion batteries can last up to 10 years or more.
Top Three Group 27 Deep Cycle Battery – Short Reviews
1. VMAX XTR27-110 AGM Group 27 Deep Cycle Battery
The VMAX XTR27-110 AGM Group 27 Deep Cycle Battery is a high-performance battery that is designed for use in various applications, such as marine, RV, and solar power systems. Here are some of the benefited features and a table of the pros and cons of this battery:
Benefited Features:
- High Capacity: The VMAX XTR27-110 AGM battery has a capacity of 110Ah, which is quite high, and can provide long hours of power backup.
- Deep Cycle Design: This battery is designed for deep cycle use, which means it can handle multiple cycles of charging and discharging without damage to its internal components.
- Maintenance-free: The AGM design of this battery eliminates the need for maintenance, making it an ideal choice for those who want a hassle-free power source.
- Durability: The VMAX XTR27-110 AGM battery is built to last, with a rugged construction that can withstand harsh environments.
- Fast Charging: This battery can be charged quickly, which is an essential feature for those who need to get back to work or play quickly.
Table of Pros and Cons:
| Pros | Cons |
| Works well with certain boats | |
| Provides much-needed power | Heavy and bulky |
| Good product, fair price | May not fit all battery compartments |
| Lasts all day with lots of use | |
| Fast Charging |
The VMAX XTR27-110 AGM Group 27 Deep Cycle Battery is a reliable and durable power source that can provide high-capacity backup for a variety of applications. Although it may be more expensive than other deep cycle batteries, its fast charging, maintenance-free design, and deep cycle capabilities make it a worthwhile investment. Its heavy and bulky design may not be suitable for all users, and it requires a charger that can handle AGM batteries.
2. POWERSTAR AGM12100 Group 27 Deep Cycle Battery
The POWERSTAR AGM12100 Group 27 Deep Cycle Battery is a high-quality battery designed for deep cycle applications such as solar power systems, marine, and RV use. Here are some of the benefited features and a table of the pros and cons of this battery:
Benefited Features:
- Deep Cycle Design: This battery is designed for deep cycle use, which means it can handle multiple cycles of charging and discharging without damage to its internal components.
- Maintenance-free: The AGM design of this battery eliminates the need for maintenance, making it an ideal choice for those who want a hassle-free power source.
- Durability: The POWERSTAR AGM12100 battery is built to last, with a rugged construction that can withstand harsh environments.
- High Capacity: The battery has a capacity of 100Ah, which is quite high and can provide long hours of power backup.
- Fast Charging: This battery can be charged quickly, which is an essential feature for those who need to get back to work or play quickly.
Table of Pros and Cons:
| Pros | Cons |
| Deep cycle design | |
| Maintenance-free | |
| Durability | Overpriced |
| High capacity | Requires a charger that can handle AGM batteries |
The POWERSTAR AGM12100 Group 27 Deep Cycle Battery is a reliable and durable power source that can provide high-capacity backup for a variety of applications. Its deep cycle design, maintenance-free operation, and fast charging make it an ideal choice for those who need a hassle-free power source. Its heavy and bulky design may not be suitable for all users, and it requires a charger that can handle AGM batteries. It may be more expensive than other deep cycle batteries.
3. Banshee Optima D27M Blue Top 900CCA Group 27 Deep Cycle Battery
The Banshee Optima D27M Blue Top 900CCA Group 27 Deep Cycle Battery is a high-performance battery that is designed for use in a variety of applications, including marine, RV, and solar power systems. Here are some of the benefited features and a table of the pros and cons of this battery:
Benefited Features:
- Dual Purpose Design: The Banshee Optima D27M battery is designed to be used as both a starting battery and a deep cycle battery, making it a versatile choice for a wide range of applications.
- Maintenance-free: The AGM design of this battery eliminates the need for maintenance, making it an ideal choice for those who want a hassle-free power source.
- Durability: The Banshee Optima D27M battery is built to last, with a rugged construction that can withstand harsh environments.
- High Capacity: The battery has a capacity of 100Ah, which is quite high and can provide long hours of power backup.
- Fast Charging: This battery can be charged quickly, which is an essential feature for those who need to get back to work or play quickly.
Table of Pros and Cons:
| Pros | Cons |
| Dual purpose design | Expensive compared to other deep cycle batteries |
| Maintenance-free | Heavy and bulky |
| Durable | |
| High capacity | |
| Fast Charging System |
The Banshee Optima D27M Blue Top 900CCA Group 27 Deep Cycle Battery is a versatile and reliable power source that can provide high-capacity backup and starting power for a variety of applications. Its dual-purpose design, maintenance-free operation, and fast charging make it an ideal choice for those who need a hassle-free power source. Its heavy and bulky design may not be suitable for all users, and it requires a charger that can handle AGM batteries. It may be more expensive than other deep cycle batteries.
Battery Charging and Maintenance
Proper Charging Techniques
To ensure the longevity of your battery, use a charger designed for deep cycle batteries and follow the manufacturer’s recommended charging rates and voltage settings.
Maintaining Your Battery’s Health
Regular maintenance is crucial for FLA batteries, including checking electrolyte levels, cleaning terminals, and equalizing charges. For AGM, gel, and Li-ion batteries, maintenance is minimal but still requires periodic inspection for damage or corrosion.
Tips for Extending Battery Life
Proper storage, charging, and usage habits can significantly extend your battery’s lifespan. Avoid over-discharging, store the battery in a cool and dry environment, and disconnect it when not in use.
Safety Precautions and Handling
Safe Handling and Storage
Always wear protective gear when handling batteries and store them in a well-ventilated area away from open flames or heat sources. Keep batteries upright to prevent leaks and avoid stacking them to prevent damage.
Disposal and Recycling
Dispose of old batteries responsibly by recycling them at an approved recycling facility. Many retailers offer battery recycling services as well.
Popular Group 27 Deep Cycle Battery Brands
Trojan
Trojan Battery Company is a leading manufacturer of deep cycle batteries, offering a wide range of FLA and AGM options for various applications.
Interstate Batteries
Interstate Batteries is a trusted brand in the battery industry, with a diverse selection of high-quality deep cycle batteries for multiple uses.
Battle Born
Battle Born specializes in Li-ion deep cycle batteries, providing lightweight and long-lasting power solutions for RV, marine, and solar applications.
VMAXTANKS
VMAXTANKS is known for their AGM deep cycle batteries, offering high performance and reliability for a variety of uses.
Odyssey
Odyssey produces premium AGM batteries with exceptional performance, durability, and a long service life.
Group 27 Deep Cycle Battery Applications
Recreational Vehicles (RVs)
Group 27 deep cycle batteries are a popular choice for RVs, providing reliable power for appliances, lighting, and other onboard systems.
Marine and Boating
Marine applications, such as trolling motors and onboard electronics, benefit from the consistent power and long-lasting performance of Group 27 deep cycle batteries.
Solar Power Systems
Off-grid solar systems often utilize Group 27 deep cycle batteries to store energy harvested from solar panels, providing a stable power supply during periods of low sunlight.
Backup Power Supply
Group 27 deep cycle batteries can serve as a backup power supply for homes and businesses, ensuring continuous operation during power outages or emergencies.
Troubleshooting Common Battery Issues
Low Battery Capacity
If your battery capacity is consistently low, check for sulfation buildup on the plates, improper charging techniques, or a faulty charger.
Swollen or Cracked Battery Case
A swollen or cracked battery case can be a sign of overcharging, overheating, or internal damage. If you notice these issues, stop using the battery and consider replacing it.
Sulfation and How to Prevent It
Sulfation is a common issue in lead-acid batteries, resulting from the buildup of lead sulfate crystals on the battery plates. This can reduce the battery’s capacity and overall performance. To prevent sulfation, ensure proper charging and avoid storing your battery in a discharged state.
Summary
Group 27 deep cycle batteries are versatile and reliable power sources for a wide range of applications. Understanding the differences between battery types, as well as proper charging and maintenance practices, can help you make an informed decision and extend the life of your battery. By choosing a reputable brand and following safety precautions, you can enjoy the benefits of a dependable, long-lasting energy solution.
Frequently Asked Questions (FAQs)
Can I use a Group 27 deep cycle battery for starting applications?
While deep cycle batteries are designed primarily for sustained power output, they can be used for starting applications in certain cases. However, they may not provide the same high current output as a dedicated starter battery.
How long will a Group 27 deep cycle battery last?
The lifespan of a Group 27 deep cycle battery depends on factors such as usage, maintenance, and environmental conditions. FLA and AGM batteries typically last 3-5 years, while gel and Li-ion batteries can last up to 10 years or more with proper care.
Can I use a standard car charger for my Group 27 deep cycle battery?
It is not recommended to use a standard car charger for deep cycle batteries, as it may not provide the appropriate charging rates and voltage settings. Instead, use a charger specifically designed for deep cycle batteries to ensure proper charging and extend battery life.
Is it possible to use multiple Group 27 batteries in parallel or series?
Yes, you can connect multiple Group 27 deep cycle batteries in parallel to increase capacity or in series to increase voltage, depending on your specific power requirements. Always consult the battery manufacturer’s guidelines when connecting multiple batteries.
What is the ideal temperature for storing a Group 27 deep cycle battery?
The ideal temperature for storing a Group 27 deep cycle battery is between 50°F and 80°F (10°C and 27°C). Storing the battery in extreme temperatures can negatively affect its performance and lifespan.
