If you're looking for a high-capacity battery for marine, RV, solar, or off-grid use, you've probably come across the term Group 31 battery. But what exactly does it mean — and why is it the go-to standard for so many high-performance applications?
In this guide, we’ll break down what makes a Group 31 battery unique, why a Group 31 lithium battery is a smart upgrade over AGM or lead-acid models, and how to choose the right one for your setup — whether it’s a trolling motor, camper, or solar power system.
What Is a Group 31 Battery?
“Group 31” refers to a standardized battery size classification used by the Battery Council International (BCI). These batteries are typically:
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13" long x 6.8" wide x 9.4" tall
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Rated for 100Ah+ capacities
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Built for deep cycle applications like marine power, RVs, off-road vehicles, and solar storage
They’re commonly used as trolling motor batteries, house batteries for boats and campers, and backup power in solar or off-grid systems.
Why Choose a Group 31 Lithium Battery?
While traditional Group 31 AGM or lead-acid batteries have been used for decades, they come with drawbacks — including heavy weight, slow charging, and a much shorter lifespan. If you're upgrading your trolling motor battery or building out a more efficient power system, Group 31 lithium batteries offer serious advantages:
Key Benefits:
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70% Lighter than comparable AGM models
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3,000–5,000+ cycles (vs. 300–500 for lead-acid)
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Faster charging with a smart lithium battery charger
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Zero maintenance — no water refills or sulfation
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Stable voltage, even under high loads (perfect for 36V trolling motor battery setups)
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Built-in Battery Management System (BMS) for safety and longevity
Whether you're powering a 12V kayak battery, a 36V lithium battery system, or using it as a boat battery, the Group 31 lithium format offers plug-and-play performance with modern efficiency.
Applications for Group 31 Batteries
Group 31 batteries are among the most versatile on the market. Common use cases include:
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Trolling motors (12V, 24V, 36V)
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Electric boat motor batteries
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RV and camper batteries
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Solar power banks
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Off-grid backup systems
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Golf carts and low-speed EVs
With options like the Group 31 lithium battery with Bluetooth monitoring, you can track performance in real-time — perfect for those running Victron monitors, LiFePO4 chargers, and smart power systems.
Don’t Forget the Right Battery Tray
When upgrading to a Group 31 lithium battery, make sure you install it securely. A Group 31 custom battery tray ensures safe, stable mounting — especially in marine environments or rugged terrain.
Look for trays that are:
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Waterproof
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Corrosion-resistant
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Compatible with your lithium model's footprint and height
This helps protect your investment and ensures performance in even the roughest conditions.
Where to Buy a Group 31 Lithium Battery
If you're searching for a high-performance, maintenance-free Group 31 lithium battery, Lithium Battery Power is your trusted source. Based in Tampa, FL, we offer:
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Premium LiFePO4 and NMC lithium batteries
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Industry-leading warranties
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Fast shipping across the U.S.
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Expert support for marine, RV, and solar applications
Whether you're replacing a worn-out AGM trolling motor battery or upgrading your entire 36V lithium battery bank, we’ve got the products and support to help you power smarter.
Final Thoughts
A Group 31 lithium battery is one of the best upgrades you can make for your power system. Lightweight, long-lasting, and incredibly efficient, it’s the perfect match for modern trolling motors, solar storage, and more.
Shop the best Group 31 batteries today and experience the difference lithium power can make.
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