2016 Kenworth T680 Battery Size & Group

Quick Answer

• BCI Group Size: Group 31 (typically 3-4 batteries in parallel)
• CCA Rating: 925-1150 CCA per battery (for optimal starting in all conditions)
• Reserve Capacity (RC): 180-220 minutes per battery
• AGM vs. Flooded: Flooded lead-acid is standard, but AGM is an excellent upgrade for improved durability and cycling ability.
• Terminal Layout: Typically top post, SAE terminals.
• Physical Dimensions: (Group 31) Approximately 13" L x 6.81" W x 9.44" H
• Dual-Battery Setup: The Kenworth T680 typically uses a multi-battery setup (3-4 Group 31 batteries) wired in parallel to achieve sufficient cranking power and reserve capacity for its diesel engine and accessories.

Replacement Battery Options

Due to the specialized nature and multi-battery setup of commercial trucks like the Kenworth T680, specific part numbers can vary widely based on distributor inventories and desired performance. Always confirm with your parts supplier.

• Interstate: Typically offers Pro-Series Group 31 batteries (e.g., MT-31P or 31-MHD) designed for heavy-duty applications.
• Exide: Often provides equivalent Group 31 heavy-duty batteries.
• East Penn (Deka): Look for their Commercial Line Group 31 batteries.
• ACDelco: Offers professional-grade Group 31 batteries suitable for commercial vehicles.

AGM vs. Flooded — Which Does This Vehicle Need?

The 2016 Kenworth T680 comes standard with flooded lead-acid batteries. These are a cost-effective and reliable choice for most applications. However, given the demands placed on a commercial truck battery — such as frequent deep discharges from auxiliary power units (APUs), hotel loads, and long-haul driving — an upgrade to Absorbent Glass Mat (AGM) batteries offers significant advantages.

Flooded Lead-Acid:

• Pros: Lower initial cost, widely available, proven technology.
• Cons: Requires occasional maintenance (checking water levels), more susceptible to vibration damage, slower to recharge, less tolerant of deep discharges.

AGM:

• Pros: Maintenance-free (sealed), more resistant to vibration, faster charging, better deep-cycle performance, longer lifespan in demanding applications, better cold-weather performance.
• Cons: Higher initial cost.

For a Kenworth T680, especially one that experiences significant "hotel loads" or operates in extreme conditions, investing in AGM batteries can lead to greater reliability, fewer roadside incidents, and a longer overall service life, justifying the higher upfront cost.

Post-Installation Relearn / Reset Procedure

After replacing the batteries in a 2016 Kenworth T680, there isn