2020 Chevrolet Silverado 3500HD Battery Size & Group

Quick Answer

• BCI Group Size: Group 48 (H6) or Group 31 (diesel models)
• CCA Rating: 720 CCA minimum for gasoline, 1000 CCA minimum for diesel
• Reserve Capacity: 120 minutes minimum for gasoline, 180 minutes minimum for diesel
• AGM vs. Flooded: Depends on original equipment and user preference; AGM generally recommended for its benefits.
• Terminal Layout: Top post
• Physical Dimensions: Varies slightly by group size; typical Group 48 (H6) is 10.9" L x 6.9" W x 7.6" H. Group 31s are larger.
• Dual-Battery Setup: Diesel models utilize a dual-battery setup.

Replacement Battery Options

• Interstate:
  • MTX-48/H6 (gasoline)
  • MTZ-48/H6 (AGM, gasoline)
  • MTP-31 (diesel, often two required)
  • MTZ-31 (AGM, diesel, often two required)
• Optima:
  • YellowTop H6 (gasoline)
  • YellowTop 31 (diesel, often two required)
• DieHard:
  • Platinum AGM H6 (gasoline)
  • Platinum AGM Group 31 (diesel, often two required)
• Odyssey:
  • Extreme Series Group 48/H6 (gasoline)
  • Extreme Series Group 31 (diesel, often two required)

AGM vs. Flooded — Which Does This Vehicle Need?

The 2020 Chevrolet Silverado 3500HD, whether gasoline or diesel, may have come with either a conventional flooded lead-acid battery or an Absorbed Glass Mat (AGM) battery from the factory, depending on the trim level and option packages. While a flooded battery will work as a direct replacement if that's what your truck originally had, an AGM battery is generally recommended as an upgrade.

AGM batteries offer several advantages:

• Durability: They are more resistant to vibration and impacts, which is beneficial for a heavy-duty truck.
• Longevity: AGM batteries typically last longer than flooded batteries under similar conditions.
• Maintenance-Free: No need to check or add distilled water.
• Better Performance: They offer improved starting power and better deep-cycle capabilities, making them well-suited for trucks with numerous electronic accessories or those that frequently tow/haul.
• Safer: They are sealed and do not vent hydrogen gas under normal operation, reducing the risk of corrosion around the battery terminals.

For diesel models, which already demand significant power for starting, opting for AGM batteries can provide an extra margin of reliability, especially in cold weather.

Post-Installation Relearn / Reset Procedure

After replacing the battery in your 2020 Chevrolet Silverado 3500HD, it's important to perform a few simple steps to ensure all systems are operating correctly. The truck