2019 Freightliner M2 106 Battery Size & Group

Quick Answer

• BCI Group Size: Group 31 (typically 3-4 batteries)
• CCA Rating: 925-1150 CCA per battery (refer to specific battery for exact rating)
• Reserve Capacity: 180-200 minutes per battery
• AGM vs. Flooded: Depends on original equipment, but often flooded; AGM is an upgrade option for improved deep cycling and vibration resistance.
• Terminal Layout: Top post (often with L-type terminals or studs for heavy-duty cables)
• Physical Dimensions: Approximately 13" L x 6.8" W x 9.4" H (per Group 31 battery)
• Dual-Battery Setup: The Freightliner M2 106, being a medium-duty commercial truck, typically features a multi-battery setup, usually 3 or 4 Group 31 batteries wired in parallel for 12V operation and increased cold cranking amps and reserve capacity.

Replacement Battery Options

Here are some popular replacement options for your 2019 Freightliner M2 106. Always verify the BCI Group 31 size and specifications to ensure compatibility.

• Interstate: Workaholic Group 31 (e.g., MT-31 or MTZ-31 - check for specific suffix)
• Odyssey: Extreme Series Group 31 (e.g., ODYSSEY 31-925, ODYSSEY 31-1000)
• ACDelco: Professional Group 31 (e.g., 31SHD)

AGM vs. Flooded — Which Does This Vehicle Need?

The 2019 Freightliner M2 106, like many commercial trucks, often comes equipped from the factory with flooded lead-acid batteries. These are a cost-effective and reliable choice for general commercial use.

However, upgrading to Absorbed Glass Mat (AGM) batteries offers several advantages, especially for a vehicle like the M2 106 that may experience demanding usage, frequent starts, or extended accessory use when the engine is off (e.g., for sleeper amenities, liftgates, or other auxiliary equipment).

Advantages of AGM Batteries for the M2 106:

• Improved Vibration Resistance: Commercial trucks are subject to significant vibration, which can shorten the life of flooded batteries. AGM batteries are more resistant to vibration damage.
• Deep Cycling Capability: If your truck sees regular deep discharges, such as powering sleeper accessories overnight, AGM batteries are designed to handle these cycles better than flooded batteries, leading to a longer service life.
• No Maintenance: AGM batteries are sealed and maintenance-free, meaning no need to check or top off electrolyte levels.
• Spill-Proof: In the event of an accident or tip-over, AGM batteries won't leak corrosive acid.
• Faster Recharging: AGM batteries generally accept a charge more efficiently than flooded batteries.

While flooded batteries are perfectly adequate for many M2 106 applications, an investment in AGM batteries can provide enhanced durability and performance, potentially reducing downtime and long-term costs, especially for vocational applications.

Post-Installation Relearn / Reset Procedure

For a 2019 Freightliner M2 106, replacing the batteries is generally straightforward, but there are a few considerations after disconnecting and reconnecting power. Unlike some modern passenger vehicles with complex Body Control Modules (BCMs) requiring extensive relearns, the M2 106 mostly deals with basic system resets.

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