2025 International LT Battery Size & Group

Quick Answer

• BCI Group Size: Group 31 (typically three to four batteries required)
• CCA Rating: 925-1150 CCA per battery (minimum recommended)
• Reserve Capacity: 170-200 minutes per battery
• AGM vs. Flooded: Primarily flooded, but AGM is an upgrade option.
• Terminal Layout: Typically top post, SAE terminals.
• Physical Dimensions: L: 13.0 in, W: 6.8 in, H: 9.4 in (Group 31 standard)
• Dual-Battery Setup: The 2025 International LT, being a heavy-duty diesel truck, utilizes a multi-battery setup, usually three or four Group 31 batteries wired in parallel for 12V operation and increased cranking power and reserve capacity.

Replacement Battery Options

Finding specific part numbers for the newest 2025 models can be challenging as specifications are still solidifying. However, here are popular heavy-duty Group 31 batteries that are suitable, often used in multiples:

• Interstate: MT31 (Flooded), MTP-27F (Flooded - typically higher CCA options available for HD)
• Optima: Optima offers Group 31 options in their YellowTop (deep cycle AGM) range, suitable for auxiliary power demands in trucks, but specific part numbers for primary starting may vary.
• DieHard: DieHard Platinum AGM Group 31 (AGM, premium option)
• Odyssey: Odyssey 31-PC2150S (AGM, premium option)
• ACDelco: ACDelco Advantage 31S-1000 (Flooded, common OEM replacement)

AGM vs. Flooded — Which Does This Vehicle Need?

The 2025 International LT typically comes equipped with flooded lead-acid batteries from the factory. These are robust, cost-effective, and provide ample starting power for heavy-duty diesel engines. However, AGM (Absorbed Glass Mat) batteries are an excellent upgrade option, especially considering the advanced electronics and auxiliary power demands in modern commercial trucks.

Flooded Batteries (Standard):

• Pros: Lower initial cost, proven technology, good for high-CCA starting.
• Cons: Require maintenance (checking water levels), more susceptible to vibration damage, can vent gases.

AGM Batteries (Upgrade):

• Pros: Maintenance-free, superior vibration resistance, sealed (no gassing), better deep-cycle capabilities (important for accessories when engine is off), longer lifespan in demanding applications, faster recharging.
• Cons: Higher initial cost.

For the demanding life of a heavy-duty truck like the International LT, especially if equipped with many electronic accessories, auxiliary power units (APUs), or often experiences long periods of engine-off power draw, the benefits of AGM often outweigh the higher cost, providing increased reliability and longevity.

Post-Installation Relearn / Reset Procedure

Modern heavy-duty trucks like the 2025 International LT often have sophisticated electrical systems that may require a relearn or reset procedure after battery disconnection or replacement. While specific procedures can vary, here