2022 Peterbilt 579 Battery Size & Group

Quick Answer

• BCI Group Size: Group 31 (typically 4 batteries)
• CCA Rating: 925-950 CCA per battery (minimum recommendations vary, always check your owner's manual for exact specs)
• Reserve Capacity: 175-190 RC per battery
• AGM vs. Flooded: Primarily flooded lead-acid from the factory, but AGM is a robust upgrade option.
• Terminal Layout: Typically top post, SAE terminals.
• Physical Dimensions: Group 31 batteries are approximately 13" L x 6.8" W x 9.4" H
• Dual-Battery Setup: The 2022 Peterbilt 579 typically utilizes a four-battery system, often wired in parallel-series for 12V operation with significant cranking power and reserve capacity.

Replacement Battery Options

Due to the specialized nature and common fleet purchasing for heavy-duty trucks, readily available consumer part numbers for specific brands like Optima or DieHard are less common for direct fit Group 31. Instead, focus on heavy-duty Group 31 batteries from reputable commercial battery suppliers. Here are general recommendations:

• Interstate: MTZ-31 (Extreme Heavy-Duty), MT-31 (Heavy-Duty Commercial)
• Odyssey: 31-925 (Odyssey Extreme Series - AGM, a common performance upgrade)
• ACDelco: 31P-950 (Professional Series - Flooded) or 31PHD (Professional Heavy Duty - Flooded)

AGM vs. Flooded — Which Does This Vehicle Need?

The 2022 Peterbilt 579 typically comes from the factory with flooded lead-acid batteries. These are a cost-effective and reliable solution for the demanding needs of heavy-duty trucks. However, upgrading to Absorbent Glass Mat (AGM) batteries offers several advantages:

• Durability and Vibration Resistance: AGMs are much more resistant to vibration, which is a significant factor in long-haul trucking. This can lead to a longer lifespan.
• Deep Cycle Capability: While primary cranking, AGMs handle deep discharges better, which is beneficial for trucks with auxiliary power units (APUs), electronic logging devices (ELDs), and other electronics that draw power when the engine is off.
• Maintenance-Free: AGMs are sealed and require no water top-offs, reducing maintenance.
• Improved Cranking in Extreme Temperatures: AGMs often maintain better performance in very cold or very hot conditions.

While not strictly "needed," AGM batteries can be a worthwhile investment for increased reliability, reduced downtime, and lower maintenance in a commercial trucking application. Ensure any replacement batteries meet or exceed the original equipment manufacturer (OEM) specifications for CCA and Reserve Capacity.

Post-Installation Relearn / Reset Procedure

For most heavy-duty trucks like the 2022 Peterbilt 579, battery replacement is generally straightforward, and there isn