2019 GMC Sierra 2500HD Battery Size & Group

Quick answer

• BCI Group Size: Group 31 (Diesel); Group H7/94R (Gasoline)
• CCA Rating: 800-1000 CCA (Diesel); 730-800 CCA (Gasoline)
• Reserve Capacity: 160-200 minutes (Diesel); 120-140 minutes (Gasoline)
• AGM vs. Flooded: Both gasoline and diesel models can benefit from AGM batteries for improved durability and performance, especially in demanding applications. Factory specification is flooded lead-acid, but an AGM upgrade is common.
• Terminal Layout: Top post, typically SAE (standard automotive).
• Physical Dimensions (Approximate):
  • Group 31 (Diesel): 13" L x 6.8" W x 9.4" H
  • Group H7/94R (Gasoline): 12.4" L x 6.9" W x 7.5" H
• Dual-Battery Setup: Yes, diesel models come standard with a dual-battery setup for enhanced starting power.

Replacement battery options

When it's time to replace the battery in your 2019 GMC Sierra 2500HD, you have several excellent options from reputable brands. Always double-check the BCI group size and CCA rating to ensure compatibility with your specific engine (gasoline or diesel).

• Interstate:
  • Diesel: Interstate Workaholic Group 31P-MHD (or similar heavy-duty Group 31 offering)
  • Gasoline: Interstate MTP-H7 (Lead-Acid) or MTZ-H7 (AGM)
• Optima Batteries:
  • Diesel: Optima YellowTop D31T (Dual-purpose, deep cycle & starting) - often used for auxiliary power or upgraded systems due to its deep cycle capabilities. Note: You would need two for a full replacement.
  • Gasoline: Optima YellowTop H7
• DieHard:
  • Diesel: DieHard Platinum Group 31 AGM (or similar heavy-duty Group 31 AGM/Flooded)
  • Gasoline: DieHard Platinum AGM H7
• Odyssey Battery:
  • Diesel: Odyssey 31-PC2150S (AGM, high performance)
  • Gasoline: Odyssey H7-94R (AGM, high performance)
• ACDelco:
  • Diesel: ACDelco Professional Group 31P (Flooded) or 31AGM (AGM)
  • Gasoline: ACDelco Professional H7-94R (Flooded) or H7-94RAGM (AGM)

Always verify the specific part number with your retailer or manufacturer as offerings can change.

AGM vs. flooded — which does this vehicle need?

The 2019 GMC Sierra 2500HD, whether equipped with the gasoline or diesel engine, originally came from the factory with flooded lead-acid batteries. However, upgrading to an Absorbed Glass Mat (AGM) battery is a very popular and often recommended choice for this generation of truck, especially for those who demand more from their vehicle.

Flooded Lead-Acid Batteries: These are the traditional, cost-effective option. They perform well under normal operating conditions but require periodic maintenance (checking water levels in some designs) and are more susceptible to vibration damage and acid leaks.

AGM Batteries: AGMs offer several significant advantages:

• Improved Durability: They are more resistant to vibration and impacts, which is beneficial for heavy-duty trucks.
• Maintenance-Free: No need to check water levels.
• Better Performance in Extreme Temperatures: Generally perform better in both very hot and very cold conditions.
• Deeper Discharge Cycles: Can withstand deeper discharge without significant damage, making them ideal for vehicles with many accessories or those used for towing/off-roading.
• Slower Self-Discharge Rate: They hold a charge longer when the vehicle is not in use.

While not strictly "needed" at the factory level, an AGM battery is a superior choice for the 2019 Sierra 2500HD, offering enhanced reliability and longevity, particularly for diesel models that require significant cranking power and often power additional accessories.

Post-installation relearn / reset procedure

After replacing the battery in your 2019 GMC Sierra 2500HD, it