BCI Group Batteries

Group 27 Batteries: Everything You Need to Know

When it comes to powering your RV or marine vehicle, choosing the right battery is crucial. With so many options on the market, it can be overwhelming to decide which one suits your needs best. Enter the Group 27 battery — a popular choice among RV and marine enthusiasts for its reliability and performance. In this comprehensive guide, we’ll dive deep into everything you need to know about Group 27 batteries, including their types, features, comparisons, and where to buy them.

Understanding Group 27 Batteries

Group 27 batteries are a type of deep cycle battery, commonly used in RVs and marine applications. These batteries are designed to provide a steady amount of power over a long period, making them ideal for situations where you need sustained energy.

Types of Group 27 Batteries

AGM Deep Cycle Battery

Absorbent Glass Mat (AGM) batteries are a popular choice due to their maintenance-free nature and long lifespan. These batteries are sealed, preventing any leakage, and can be installed in various positions. The Duracell Group 27 AGM Battery is a notable option, providing excellent performance and reliability.

Lithium Deep Cycle Battery

Lithium batteries are known for their lightweight design and high energy density. A Group 27 lithium battery, while more expensive upfront, offers a longer lifespan and faster charging times compared to traditional lead-acid batteries.

Lead-Acid Deep Cycle Battery

Traditional lead-acid batteries, like the Exide Group 27 Deep Cycle Battery, have been around for years and are known for their durability and reliability. While they require regular maintenance, they are often more affordable than their AGM and lithium counterparts.

Comparing Group 27 vs. Group 31 Batteries

When deciding between a Group 27 and a Group 31 battery, it’s essential to consider your power needs and space constraints. Group 31 batteries are larger and offer more capacity, making them suitable for high-energy applications. However, Group 27 batteries strike a balance between size and power, fitting better in tighter spaces while still providing ample energy.

Key Features to Consider before Shopping

When shopping for a Group 27 battery, here are some critical features to keep in mind:

  • Capacity: Measured in amp-hours (Ah), the capacity indicates how much energy the battery can store.
  • Maintenance: AGM and lithium batteries are typically maintenance-free, while lead-acid batteries require regular upkeep.
  • Lifespan: Lithium batteries generally last the longest, followed by AGM and lead-acid batteries.
  • Cost: While lithium batteries have a higher upfront cost, they can be more cost-effective in the long run due to their longevity.

Top Group 27 Batteries on the Market

Duracell Marine Battery Group 27 Reviews

Duracell is a well-known name in the battery world, and their Group 27 marine battery is no exception. Users praise its reliability, long lifespan, and excellent performance in various marine applications.

Exide Group 27 Deep Cycle Battery

The Exide Group 27 Deep Cycle Battery is another solid choice, known for its durability and ability to withstand harsh conditions. It’s a great option for those looking for a dependable lead-acid battery.

Group 27 Lithium Battery

For those seeking a lightweight and long-lasting option, a Group 27 lithium battery is worth considering. While more expensive, the investment pays off with a longer lifespan and faster charging times.

Battery Accessories and Enhancements

Group 27 Vented Battery Box

A vented battery box is essential for safely housing your battery, especially if you’re using a lead-acid type. The NOCO Group 27 Battery Box is a popular choice, offering robust protection and proper ventilation.

Dual Group 27 Battery Tray

If you need to run two batteries in parallel for increased capacity, a dual battery tray is a must-have. The dual Group 27 battery tray allows for secure mounting and easy installation of two batteries side by side.

Installation and Maintenance Tips

  • Proper Ventilation: Ensure your battery box is well-ventilated to prevent gas buildup.
  • Regular Checks: Even maintenance-free batteries should be checked periodically for any signs of wear or damage.
  • Clean Connections: Keep the battery terminals clean and free from corrosion to ensure optimal performance.

Where to Buy Group 27 Batteries


Costco is a reliable retailer for purchasing Group 27 batteries, offering a range of options from reputable brands. Their competitive prices and warranty options make them a favorite among RV and marine enthusiasts.


Walmart also stocks a variety of Group 27 batteries, including AGM and lead-acid types. Their wide availability and affordable pricing make them a convenient option for many buyers.


Q: What is the difference between Group 27 and Group 27F batteries?

A: The main difference lies in the terminal placement. Group 27F batteries have their terminals in a different position compared to standard Group 27 batteries, which can affect installation compatibility.

Q: Is a Group 27 deep cycle battery an AGM battery?

A: Not necessarily. While some Group 27 deep cycle batteries are AGM, others can be lead-acid or lithium. It’s essential to check the specific type before purchasing.

Q: How long does a Group 27 battery last?

A: The lifespan of a Group 27 battery depends on its type and usage. Generally, AGM batteries last around 4-7 years, lithium batteries can last over 10 years, and lead-acid batteries typically last 3-5 years.


Choosing the right Group 27 battery for your RV or marine needs can significantly impact your overall experience. Whether you opt for an AGM, lithium, or lead-acid battery, each type has its unique advantages. By considering factors like capacity, maintenance, and cost, you can find the perfect battery to keep your adventures powered up. Don’t forget to check out retailers like Costco and Walmart for the best deals on Group 27 batteries and accessories. Happy travels and smooth sailing!