2025 Volvo VNL Battery Size & Group

Quick answer

• BCI Group Size: Group 31 (typically three or four batteries)
• CCA Rating: 925-1000 CCA per battery (minimum)
• Reserve Capacity: 170-190 minutes per battery
• AGM vs. Flooded: Flooded lead-acid is standard, but AGM is a popular upgrade for increased durability and longer life.
• Terminal Layout: Typically SAE/post terminals (standard top post).
• Physical Dimensions (Group 31): 13" L x 6 13/16" W x 9 7/16" H (per battery, approximate)
• Dual-Battery Setup: The 2025 Volvo VNL, like most heavy-duty diesel trucks, utilizes a multi-battery bank (typically three or four Group 31 batteries) wired in parallel to achieve the necessary cranking power and reserve capacity.

Replacement battery options

For your 2025 Volvo VNL, several reputable battery manufacturers offer high-quality Group 31 batteries. While specific part numbers can vary by retailer and exact battery specifications (e.g., standard, deep cycle, AGM), here are common series or types to look for:

• Interstate: MT31 (Flooded), MTP-GC2 (Flooded, often used in series for 12V), AGM Group 31 options.
• Optima: While Optima is known for its YellowTop and RedTop batteries, a direct Group 31 equivalent for heavy-duty starting power may be less common, as Optima often focuses on smaller group sizes with higher cycling capabilities. However, some heavy-duty Optima batteries might be available through specialized dealers.
• DieHard: DieHard Platinum (AGM Group 31), DieHard Gold (Flooded Group 31).
• Odyssey: Odyssey 31-PC2150S (AGM, known for high CCA and deep cycle capabilities).
• ACDelco: ACDelco Advantage or Professional Group 31 (Flooded or AGM options available).

Always verify the exact part number and specifications with your supplier to ensure compatibility with your VNL's electrical system requirements.

AGM vs. flooded — which does this vehicle need?

The 2025 Volvo VNL typically comes equipped with conventional flooded lead-acid batteries from the factory. These batteries are a proven and cost-effective solution for heavy-duty applications, providing reliable starting power and good cycle life under normal operating conditions.

However, many VNL owners and fleet operators choose to upgrade to Absorbent Glass Mat (AGM) batteries. AGM batteries offer several advantages:

• Increased Durability: AGM batteries are more resistant to vibration, which is a significant factor in heavy-duty truck operation.
• Longer Lifespan: They generally have a longer service life compared to flooded batteries, especially in demanding applications.
• Maintenance-Free: AGM batteries are sealed and do not require watering.
• Improved Cycling Capability: Better for vehicles with significant auxiliary power demands (e.g., APUs, inverters) that experience frequent deep discharges.
• Better Performance in Extreme Temperatures: They tend to perform better in very cold or very hot conditions.

While AGM batteries have a higher upfront cost, their extended lifespan and reduced maintenance can lead to a lower total cost of ownership over time. Either flooded or AGM batteries are suitable for the 2025 Volvo VNL, but AGM offers a performance and durability upgrade.

Post-installation relearn / reset procedure

After disconnecting and replacing the batteries on your 2025 Volvo VNL, several electronic systems may lose their learned parameters or settings. While there isn't typically a complex