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Group 24 vs Group 27 Batteries: What’s the Difference?

by David Lee
Group 24 vs Group 27 Batteries

Group 24 and Group 27 batteries are common power sources in RVs, marine applications, backup power systems, and medical devices. These batteries are widely used in many applications, but what sets them apart? Let’s dive into the key differences between Group 24 and Group 27 batteries.

What is a Group 24 Battery?

A Group 24 battery is a standard-sized battery measuring 10.5" L x 6.19" W x 8.88" H. It’s commonly used in vehicles, backup power systems, and medical equipment. Group 24 batteries are typically deep cycle batteries, designed to provide sustained power over a longer period, rather than just starting an engine.

what is group 24 battery

What is a Group 27 Battery?

Group 27 batteries are also standard-sized but larger than Group 24. They measure 12.5" L x 6.75" W x 9.37" H. These batteries are often used in RVs, boats, off-grid systems, and backup power applications. Group 27 batteries offer more amp hours, meaning they can store and deliver more energy than Group 24 batteries.

Key Differences: Group 24 vs Group 27

1. Size and Dimensions

  • Group 24: 10.5" L x 6.19" W x 8.88" H.
  • Group 27: 12.5" L x 6.75" W x 9.37" H.

The two batteries are identical in width and height. However, the Group 27 battery is longer, making it too large for some compartments designed for Group 24 batteries. If you have a battery compartment for Group 27, it should fit a Group 24 battery, but not the other way around.

2. Capacity

Group 27 batteries have a higher capacity, meaning they provide more power. The higher the group number, the more amp hours a battery can store.

3. Chemistry

Both Group 24 and Group 27 batteries come in a variety of chemistries, including:

  • Sealed Lead Acid (SLA)
  • Absorbent Glass Mat (AGM)
  • Gel-cell
  • Flooded Lead Acid (FLA)
  • Lithium

Lead-acid batteries are cheaper, but lithium batteries last longer and are more environmentally friendly.

4. Common Applications

Group 24: Often used in:

  • Backup power systems
  • Large UPS systems
  • Medical devices like wheelchairs
  • Security and industrial applications

They’re also suitable for use as starting or cranking batteries for small engines.

Group 27: Used in

  • Off-grid setups
  • RVs
  • Boats
  • Automotive applications
  • Backup power systems

These batteries are ideal for applications requiring more power and longer-lasting performance.

Which Battery Should You Choose?

Before purchasing a battery, check the size, capacity, and intended use. The battery’s group size affects its physical dimensions and performance, including terminal locations and accessories needed (like inverters and chargers).

If you’re replacing a battery in an RV, a Group 24 deep cycle battery might be the right fit. It’s a common size for RVs.

LiTime 12V 100Ah Group 24 Lithium RV Battery
LiTime 12V 100Ah Group 24 Lithium RV Battery $189.99 Click to View

Upgrade to a Lithium Group 24 Battery for Better Performance

If you want to improve your power system, upgrading to a Lithium Group 24 battery is a smart move. Lithium batteries offer many benefits over traditional lead-acid ones. Whether you’re using them in an RV, boat, or backup system, switching to lithium can enhance your experience. Here’s why:

1. Longer Lifespan

Lithium batteries last far longer than lead-acid. A typical Group 24 lead-acid battery lasts 2-3 years. In contrast, a Lithium Group 24 can last 10 years or more with proper care. This means fewer replacements and lower long-term costs.

2. More Power, Less Weight

Lithium batteries are more energy-dense than lead-acid. They offer greater energy whilst being smaller and lighter. In an RV or boat, this means longer trips with less weight to carry. They also charge faster, so you can hit the road or water sooner.

3. Faster Charging

Lithium batteries charge quickly. A Group 24 lead-acid might take hours to recharge, but a Lithium Group 24 charges in half the time. This keeps your devices running without long waits.

Related reading: Best Ways to Charge LiFePO4 Lithium Battery

4. Better Performance in Cold

Lithium batteries perform better in extreme conditions. Lead-acid batteries lose power in cold temperatures. Lithium batteries, however, maintain their strength even in freezing weather. This makes them perfect for winter camping, boating, or off-grid living.

Suggest reading: Do Lithium Batteries Freeze?

5. Built-in Safety Features

Most lithium batteries have a Battery Management System (BMS). The BMS protects against overcharging, over-discharging, high temperature and short-circuiting. This maintains the battery secure and extends its life. Plus, you don’t have to worry about maintenance problems like acid spills or corrosion, which are common with lead-acid batteries.

group 24 battery with built in safety features

6. Environmentally Friendly

Lithium batteries are eco-friendly. They don’t contain harmful chemicals, and they’re easier to recycle. By upgrading to a Lithium Group 24, you’ll reduce your carbon footprint and help the planet.

7. No Maintenance Needed

Lithium batteries require little to no maintenance. Unlike lead-acid batteries, which need regular checks (like water levels or terminal cleaning), lithium batteries just work. Once installed, they’re almost maintenance-free, saving you time and effort.

FAQs about Group 24 VS Group 27 Battery

Can Group 24 and Group 27 Batteries Be Interchanged?

While Group 24 and Group 27 batteries have different sizes, they may still be interchangeable depending on your vehicle or system’s available space. Group 27 batteries are larger but deliver more power. If size isn’t an issue, you can use a Group 27 battery in place of a Group 24. However, check your system’s requirements to ensure compatibility.

For more information about different group size battery, can click on Group 24 VS Group 31 Deep Cycle Battery for more reading.

Which is Better? Group 24 or Group 27?

It depends on your needs. Group 27 batteries are better for high-power applications, such as heavy commercial equipment and larger RVs. They provide more energy, last longer, and are more suitable for high-drain systems. However, Group 24 batteries are still a solid choice for smaller, less power-hungry devices.

Group 24 batteries are often found in cars and other small vehicles. While they don’t deliver as much power as Group 27 batteries, they are sufficient for low current applications. Some Group 24 models offer 500-840 Cold Cranking Amps (CCA), which makes them suitable for starting small engines like motorcycles or snowmobiles.

Can I Mix Group 24 and Group 27 

No. Mixing 24 and 27 battery packs is generally not recommended due to potential installation and performance issues. While voltage compatibility exists, size mismatches may affect overall efficiency and safety. Following proper installation procedures and consulting manufacturer guidelines will ensure optimal battery setup and minimize risk.

To mix or connect the battery in series or in parallel, LiTime suggest that

  • The batteries must be of the same capacity (Ah) and have the same Battery Management System (BMS) rating (A) for lithium batteries.
  • They should be from the same brand, as different brands of batteries have different BMS configurations or battery cells.
  • It is best to buy them within a similar time frame, preferably within a month.

Conclusion

When choosing between Group 24 and Group 27 batteries, consider the size, power requirements, and application of your system. Group 27 batteries offer more power and are ideal for larger systems. However, Group 24 batteries are more compact and work well for smaller devices and backup power solutions.

If you're ready to experience the benefits of lithium power, consider upgrading to a Lithium Group 24 battery. Whether you're replacing an old lead-acid battery or setting up a new system, this upgrade will take your power experience to the next level. Reach out to the LiTime team for more information on how our Lithium Group 24 batteries can improve your setup.

David Lee David Lee is a renewable energy consultant and off-grid living enthusiast with extensive experience in designing and implementing independent energy systems. He graduated with a degree in Renewable Energy Engineering from the University of Sydney and has worked on projects worldwide, from remote cabins to sustainable communities. Additionally, he has in-depth knowledge of battery applications in golf carts, helping to enhance their performance and sustainability. Beyond his professional work, David enjoys spending time in nature, exploring sustainable living practices, and sharing his experiences through his writing.
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