2020 Volvo VNR Battery Size & Group

Quick Answer

• BCI Group Size: Group 31 (typically three batteries)
• CCA Rating: 925-1000 CCA per battery
• Reserve Capacity: 180-200 minutes per battery
• AGM vs. Flooded: Flooded lead-acid batteries are standard, but AGM can be a good upgrade for durability.
• Terminal Layout: Typically SAE post, top terminal.
• Physical Dimensions: (Group 31) Approximately 13" L x 6.8125" W x 9.4375" H
• Dual/Multi-Battery Setup: The 2020 Volvo VNR utilizes a multi-battery setup, commonly three Group 31 batteries, wired in parallel for its 12V system.

Replacement Battery Options

For a 2020 Volvo VNR, you'll need three heavy-duty Group 31 batteries. Here are some popular options:

• Interstate: MTZ-31P (Mega-Tron Plus), 31P-MHD (Workaholic)
• Optima: Optima offers some commercial batteries, but Group 31 is less common in their direct-fit lineup. You may need to verify specific models.
• DieHard: Platinum Commercial Group 31P (AGM) or Gold Commercial Group 31P (Flooded)
• Odyssey: 31-PC2150S (AGM, Extreme Series)
• ACDelco: 31P-925 (Professional Heavy Duty flooded)

AGM vs. Flooded — Which Does This Vehicle Need?

The 2020 Volvo VNR typically comes from the factory equipped with conventional flooded lead-acid batteries. These are a cost-effective and reliable choice for most applications in heavy-duty trucks.

However, upgrading to Absorbent Glass Mat (AGM) batteries can offer several advantages, especially for trucks that experience high vibration, frequent deep cycling (from auxiliary loads), or operate in extreme temperatures. AGM batteries are sealed, maintenance-free, more resistant to vibration, and generally have a longer lifespan. While they come at a higher upfront cost, their benefits can outweigh the expense in certain vocational applications.

When replacing, you can certainly opt for high-quality flooded Group 31 batteries, or you can choose to upgrade to AGM for enhanced performance and durability. If you do switch to AGM, it's generally recommended to replace all batteries with AGM to maintain system balance.

Post-Installation Relearn / Reset Procedure

After replacing the batteries in your 2020 Volvo VNR, there isn't a complex "relearn" procedure for the engine computer like you might find in some passenger vehicles. However, a few things are worth noting:

1. Radio/Infotainment System: You may need to re-enter any security codes for the radio or infotainment system, if applicable. Station presets will likely be lost.
2. Date/Time: The clock and date will need to be reset.
3. Engine ECU: The Engine Control Unit (ECU) may lose some learned parameters related to idle speed or fuel trims. The vehicle's computer will re-learn these parameters over the first few drive cycles. You might notice slightly different shifting patterns or idle behavior initially, but this should normalize quickly.
4. **Diagnostic Trouble Codes (DTCs):**brief power interruption can sometimes trigger "soft" codes or historical codes in various modules. Often, these will clear themselves after a few drive cycles once the system sees everything is normal. If a "check engine" or other warning light persists, it's advisable to have the vehicle scanned professionally.

Important: Always ensure all connections are clean and tight. Loose connections can lead to poor charging, system malfunctions, and even arcing.

Signs of a Failing Battery

Recognizing the signs of a dying battery early can save you from being stranded. For a multi-battery system like in the Volvo VNR, issues can sometimes be subtle initially.

• Slow Cranking: The most common sign. The engine turns over sluggishly, especially during cold starts.
• Dim Lights: Headlights or interior lights appear dim when the engine is off or at idle.
• Warning Lights: A battery or charging system warning light on the dashboard.
• Electrical Component Malfunctions: Intermittent issues with accessories like the radio, power windows, or dashboard displays.
• Swollen Battery Case: A severely overcharged or failing battery can sometimes swell or bulge.
• Corrosion: Excessive corrosion around the battery terminals can indicate an issue, though a small amount is normal over time.
• Low Voltage Readings: A multimeter showing less than 12.4V (for a fully charged 12V battery) with the engine off.

Common Battery Issues for This Generation

Heavy-duty trucks like the Volvo VNR put significant demands on their battery systems due to their powerful engines, numerous electrical accessories (think sleepers, APUs, telematics), and often long operating hours. Common issues include:

• Vibration Damage: Constant vibration from road conditions can loosen internal components or cause plate damage in conventional flooded batteries. AGM batteries are more resistant to this.
• Deep Cycling: Running auxiliary loads (like a sleeper