Group 24 Marine Battery Dimensions, Specs and Alternatives Explained

What are the dimensions, specs, and best alternatives for a Group 24 marine battery? A Group 24 marine battery is a compact, powerful, and widely used deep-cycle battery ideal for marine and RV use. This guide covers everything you need to know about Group 24 batteries—from exact size and capacity to top alternatives and installation tips. If you’re searching for the right marine battery or planning to upgrade, this resource will help you make the best choice.

Part 1. What is a Group 24 marine battery?

A Group 24 marine battery is a deep-cycle battery classified by the Battery Council International (BCI) based on its physical size. These batteries are commonly used for marine applications like powering trolling motors, fish finders, lights, and onboard electronics. Group 24 batteries are also frequently used in RVs and solar energy systems.

Available in flooded lead-acid, AGM, and lithium-ion, these batteries vary in performance, weight, and cost.

Part 2. What are the exact dimensions of a Group 24 marine battery?

The standard dimensions of a Group 24 battery are:

• Length: 10.25 inches (260 mm)
• Width: 6.8125 inches (173 mm)
• Height: 8.875 inches (225 mm)

These dimensions ensure compatibility with most battery boxes and compartments designed for Group 24 batteries.

Part 3. How much does a Group 24 marine battery weigh?

The weight of a Group 24 battery depends on its chemistry:

• Flooded Lead-Acid: 45–50 lbs
• AGM: ~45 lbs
• Lithium-Ion: 20–30 lbs

Lithium-ion batteries are significantly lighter and easier to install, especially in boats where every pound counts.

Part 4. What capacity and voltage should you expect?

Group 24 batteries are typically 12-volt units. Here’s what to expect:

• Capacity: 70Ah to 85Ah (lead-acid and AGM)
• Capacity: Up to 100Ah (lithium-ion)

Here’s a quick comparison:

Part 5. What are the common uses of a Group 24 marine battery?

Group 24 marine batteries are versatile and reliable. Common applications include:

• Trolling motors
• Fish finders and sonar systems
• Cabin and navigation lights
• Bilge pumps
• 12V appliances and accessories
• RV power systems
• Solar backup systems

They’re ideal for moderate-duty power needs in compact spaces.

Part 6. Group 24 vs. Group 27: What’s the difference?

Group 24 vs. Group 27, the main differences are size and power capacity:

If you need more runtime and your space allows, Group 27 is a step up.

Part 7. What are the best Group 24 marine battery brands?

There are many reliable brands on the market. Here are some top options:

• Optima – Known for AGM spiral cell technology
• Vmaxtanks – High-performance deep-cycle AGM
• Renogy – Offers both AGM and lithium models
• Battle Born – Premium lithium batteries with long lifespan
• Interstate – Widely available and trusted for durability

Ufine Battery is a leading lithium battery manufacturer offering highly customizable B2B solutions. If you’re an OEM, distributor, or system integrator, Ufine provides tailor-made Group 24 lithium battery packs designed for marine, RV, and solar energy applications. Our solutions support:

• Custom voltage and capacity
• Smart BMS integration
• Waterproof and vibration-resistant enclosures
• OEM/ODM services for branding and hardware integration

We specialize in helping businesses build better energy systems with safe, long-lasting lithium battery technology.

Part 8. Are lithium Group 24 batteries worth it?

Yes, lithium batteries offer several advantages:

• Longer lifespan (up to 10 years or 3000+ cycles)
• Lightweight (up to 50% lighter)
• Faster charging
• More usable capacity
• Virtually maintenance-free

Although the upfront cost is higher, the total cost of ownership is lower due to their durability and efficiency.

Part 9. What are the best alternatives to Group 24 marine batteries?

If Group 24 doesn’t meet your needs, consider these alternatives:

1. Group 27 – More capacity, slightly larger
2. Group 31 – Heavy-duty, high-capacity models
3. Lithium 100Ah batteries – Compact and powerful
4. Dual-purpose batteries – For both starting and deep-cycle use
5. Custom battery packs – For advanced or commercial applications

Always check your system voltage and space constraints before switching.

Part 10. How to install and maintain a Group 24 marine battery?

Installation steps:

1. Turn off all power systems
2. Remove the old battery carefully
3. Clean terminals and check cables
4. Place the new battery securely in the tray
5. Connect positive cable first, then negative
6. Tighten all connections and test the system

Maintenance tips:

• Use a smart charger when stored
• Keep terminals clean and corrosion-free
• Check charge level regularly
• For lead-acid batteries, check water levels monthly
• Avoid over-discharging lithium batteries

Proper care can double your battery’s lifespan.

Part 11. FAQs about Group 24 marine battery