What is a Group 31 battery? A Group 31 battery is a heavy-duty, 12-volt lead-acid battery designed for high-capacity applications. With dimensions around 13″ x 6.8″ x 9.4″, it provides 75-125 Ah capacity and 800-1,200 CCA. Commonly used in marine, RV, solar, and commercial vehicles, its robust construction supports deep-cycle and starting power needs.
What Is a Group Size 24 Battery?
What Are the Key Specifications of Group 31 Batteries?
Group 31 batteries feature standardized dimensions (13″ L x 6.8″ W x 9.4″ H) and terminal placements. Their capacity ranges from 75-125 amp-hours (Ah) with cold cranking amps (CCA) between 800-1,200. Flooded, AGM, and lithium-ion variants exist, with weight varying from 50 lbs (AGM) to 70 lbs (flooded). Deep-cycle versions support 400+ discharge cycles at 50% depth.
Advanced models now incorporate hybrid designs that combine starting and deep-cycle capabilities. The terminal configuration typically follows SAE standards with top-mounted posts, though some marine variants feature dual terminals. Recent innovations include built-in charge indicators and reinforced internal grids that reduce plate shedding by 40% compared to previous generations.
Top 5 best-selling Group 14 batteries under $100
| Product Name | Short Description | Amazon URL |
|---|---|---|
|
Weize YTX14 BS ATV Battery  |
Maintenance-free sealed AGM battery, compatible with various motorcycles and powersports vehicles. | View on Amazon |
|
UPLUS ATV Battery YTX14AH-BS  |
Sealed AGM battery designed for ATVs, UTVs, and motorcycles, offering reliable performance. | View on Amazon |
|
Weize YTX20L-BS High Performance  |
High-performance sealed AGM battery suitable for motorcycles and snowmobiles. | View on Amazon |
|
Mighty Max Battery ML-U1-CCAHR  |
Rechargeable SLA AGM battery with 320 CCA, ideal for various powersport applications. | View on Amazon |
|
Battanux 12N9-BS Motorcycle Battery  |
Sealed SLA/AGM battery for ATVs and motorcycles, maintenance-free with advanced technology. | View on Amazon |
| Type | Weight | Cycle Life | Recharge Time |
|---|---|---|---|
| Flooded | 65-70 lbs | 400 cycles | 8-10 hours |
| AGM | 50-60 lbs | 600 cycles | 5-7 hours |
| Lithium | 25-35 lbs | 3,000+ cycles | 2-4 hours |
Where Are Group 31 Batteries Most Commonly Used?
These batteries power marine vessels (trolling motors/electronics), RVs (house/auxiliary systems), solar energy storage, commercial trucks (refrigeration/emergency lighting), and off-grid applications. Their vibration resistance and spill-proof designs make them ideal for mobile installations. Case studies show 20% longer runtime in marine applications compared to Group 27 batteries.
How Does Temperature Affect Group 31 Battery Performance?
Capacity decreases 1% per 1°F below 80°F. At 0°F, CCA drops 30-40%. High temperatures (above 95°F) accelerate corrosion, reducing lifespan by 50% per 15°F increase. Thermal management systems can mitigate these effects, maintaining optimal operating range. Cold weather packages with insulated cases show 15% performance improvement in sub-freezing conditions.
Recent field tests demonstrate that AGM batteries maintain 85% of their rated capacity at 20°F when using heated battery blankets. Lithium variants perform better in cold, retaining 92% capacity at 32°F compared to lead-acid’s 78%. However, charging below freezing requires special considerations – lithium batteries need internal heating elements to prevent plating damage during low-temperature charging.
“The Group 31 category is undergoing its most significant transformation since standardization in 1947. With lithium adoption surpassing 18% in marine markets and AI-driven battery management systems becoming standard, we’re seeing cycle lives that challenge traditional ROI models. The next frontier is solid-state designs that could triple energy density while maintaining the rugged form factor.”
– Dr. Ellen Briggs, Power Systems Engineer at Maritime Energy Solutions
FAQ
- Can Group 31 batteries be used as drop-in replacements?
- Yes, provided the compartment accommodates their larger size and weight.
- What’s the typical warranty period?
- 12-36 months for lead-acid, 3-10 years for lithium variants.
- Are special chargers required?
- AGM/Lithium models need compatible chargers to prevent damage.
- How to test Group 31 battery health?
- Use a hydrometer (flooded) or conductance tester (AGM) when fully charged.