2017 Kenworth T680 Battery Size, Group & Replacement Guide

Quick answer: 2017 Kenworth T680 Battery

• BCI Group Size: Group 31
• Type: Dual-battery setup (four batteries total, in two banks of two)
• Cold Cranking Amps (CCA): 950–1000 CCA per battery is recommended
• Battery Type: AGM (Absorbent Glass Mat) is strongly recommended
• Terminal Layout: SAE Post (Top Post)
• Physical Dimensions (approximate): 13" L x 6.8" W x 9.5" H (330mm x 173mm x 240mm)

Replacement battery options

For a 2017 Kenworth T680, you will typically need to replace all four batteries at the same time to ensure balanced performance and charging. Using high-quality, heavy-duty AGM batteries is crucial for longevity and to power the truck's extensive electronic systems. Here are some popular and trusted replacement options:

• Odyssey Extreme Series: ODX-AGM31 (Part number: 31-925S)
• Interstate Batteries: 31-AGM7
• Optima Batteries: DH31 YellowTop AGM
• ACDelco: ACDB31E (Formerly S2000)
• DieHard: 31-AGM

AGM vs flooded — which does this vehicle need?

While the T680 could use traditional flooded lead-acid batteries, it is highly recommended to use AGM (Absorbent Glass Mat) batteries. The 2017 model year T680 is equipped with numerous electronic modules, an advanced HVAC system (including no-idle APU options), and complex engine management systems. AGM batteries are better suited to handle these high electrical demands and the significant vibrations of a heavy-duty truck. They are also spill-proof, maintenance-free, and offer a longer service life under the demanding conditions of commercial trucking.

Post-installation relearn / reset procedure

One of the benefits of this generation of Kenworth trucks is their robust electrical design. For a simple battery replacement, there is no complex relearn or reset procedure required.

However, it is critical to follow the correct procedure for disconnecting and reconnecting the batteries to avoid causing electrical faults or damaging sensitive electronic modules. Always disconnect the negative terminals first and reconnect them last. After a complete power disconnect, the truck's various electronic control units (ECUs) will reboot and recalibrate on their own upon startup. You may lose trip data, fuel economy averages, and clock settings, but the core engine and transmission parameters will not be affected.

Signs of a failing battery

• Slow Engine Crank: The most obvious sign. The engine turns over sluggishly, especially in cold weather.
• "Low Voltage" Dash Warnings: The T680's driver information center will alert you to low battery voltage.
• Inverter or APU Problems: The auxiliary power unit (APU) or inverter may not function correctly or may shut down unexpectedly.
• Dimming Lights: Headlights and interior lights dimming during engine cranking or when using accessories.
• Corrosion on Terminals: Visible white or greenish powder around the battery posts indicates leaking and a failing battery.

Common battery issues for this generation

This generation of the T680 relies heavily on its electrical system. A common issue is premature battery failure due to an imbalanced battery bank. If one battery fails, it can quickly degrade the others. This is why it is essential to replace all four batteries at once. Another frequent problem is parasitic draw—a component or system that continues to draw power when the truck is off. Identifying and fixing these draws is key to extending battery life. Finally, loose or corroded battery cable connections are a frequent source of starting and charging problems.

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