2019 Volvo VNR Battery Size & Specs

Quick answer: 2019 Volvo VNR Battery

• BCI Group Size: Group 31
• Cold Cranking Amps (CCA): 950-1000 CCA per battery
• Setup: Four-battery setup (standard)
• Battery Type: AGM (Absorbent Glass Mat) required
• Terminal Layout: Top post, standard (SAE) terminals

Replacement battery options

• Interstate: 31-AGM7
• Odyssey: 31-PC2150S
• ACDelco: 31-AGM

AGM vs flooded — which does this vehicle need?

The 2019 Volvo VNR requires Absorbent Glass Mat (AGM) batteries. The VNR's sophisticated electronics and charging system are designed for the specific voltage stability and deep-cycling capabilities of AGM batteries. Additionally, the truck's battery box is often located inside the cab or in a place where venting corrosive gases would be unsafe, making the sealed, spill-proof design of AGMs a necessity.

Using a conventional flooded lead-acid battery in a system designed for AGM is not recommended and can lead to several problems. The charging system may overcharge a flooded battery, leading to gassing, water loss, and a significantly shortened lifespan. Furthermore, the higher internal resistance of a flooded battery may not provide the stable voltage required by the truck's sensitive electronic modules, potentially causing faults or malfunctions.

Post-installation relearn / reset procedure

After replacing the batteries in a 2019 Volvo VNR, a battery monitoring system reset is recommended. The truck's body control module (BCM) tracks the battery's state of charge and state of health over time. When new batteries are installed, this system needs to be reset to "learn" the new batteries' characteristics for accurate charging and monitoring.

This reset procedure typically requires a diagnostic scan tool that can communicate with the Volvo's BCM. A qualified technician will navigate to the BCM functions and select the "battery replacement" or "BMS reset" function. Failing to perform this reset can result in the system undercharging the new batteries, leading to a shorter-than-expected service life.

Signs of a failing battery

• Slow Cranking: The most obvious sign. The engine will turn over sluggishly, especially in cold weather.
• Warning Lights: A "Check Battery" or "Low Voltage" warning may appear on the driver information display.
• Electrical Issues: Dimming headlights during cranking, flickering interior lights, or malfunctioning electronic components can all point to a weak battery set.
• No-Start Condition: The engine fails to crank entirely, often accompanied by a clicking sound from the starter solenoid.

Common battery issues for this generation

• Parasitic Drains: The complex electronics on the VNR can sometimes lead to parasitic drains, where a module or component continues to draw power after the truck is shut off. This can drain the batteries overnight or over a few days.
• Charging System Faults: While robust, the alternator or voltage regulator can fail, leading to either undercharging or overcharging of the batteries.
• Vibration Damage: As with any heavy truck, constant vibration can take its toll on battery internals. Using high-quality, vibration-resistant Group 31 AGM batteries is crucial for longevity.

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