2014 Ram 3500 Battery Size & Group

Quick Answer

The 2014 Ram 3500, especially models equipped with the Cummins diesel engine, utilize a dual-battery setup to meet their significant electrical demands. Here are the key specifications:

• BCI Group Size: Group 65 (for gasoline engines) or Group 34/78 (for diesel engines)
• Cold Cranking Amps (CCA): 750-850 CCA per battery (diesel), 750 CCA (gasoline)
• Reserve Capacity (RC): 120-150 minutes per battery
• AGM vs. Flooded: While flooded lead-acid batteries are standard, AGM (Absorbed Glass Mat) batteries are a popular upgrade for their durability and consistent power delivery.
• Terminal Layout: Top post (SAE terminals)
• Physical Dimensions: (Approximate, can vary by manufacturer and group size)
  • Group 65: 12" L x 7.5" W x 7.4" H
  • Group 34/78: 10.25" L x 6.8" W x 7.9" H
• Dual-Battery Setup: Yes, all diesel-powered 2014 Ram 3500 trucks come with a dual-battery system, typically two Group 34/78 batteries wired in parallel.

Replacement Battery Options

When it's time to replace your batteries, several reputable brands offer excellent options. Always verify the group size and specifications to ensure a perfect fit for your 2014 Ram 3500.

• Interstate:
  • For diesel (dual): MTP-34/78 (or equivalent AGM)
  • For gasoline: MTP-65 (or equivalent AGM)
• Optima:
  • For diesel (dual): YellowTop D34/78 (AGM)
• DieHard:
  • Check for Platinum AGM Group 34/78 (diesel) or Group 65 (gasoline)
• Odyssey:
  • For diesel (dual): PC1500DT (AGM)
• ACDelco:
  • Check for ACDelco Professional Group 34/78 (diesel) or Group 65 (gasoline)

(Note: Specific part numbers may vary or be superseded. Always confirm with the retailer or manufacturer.)

AGM vs. Flooded — Which Does This Vehicle Need?

Your 2014 Ram 3500 originally came with flooded (wet cell) lead-acid batteries from the factory. These are perfectly adequate for most drivers and are generally a more economical choice. However, AGM (Absorbed Glass Mat) batteries offer significant advantages, especially for the demanding needs of a heavy-duty truck like the Ram 3500.

AGM benefits include:

• Improved Durability: More resistant to vibration, which is common in trucks.
• Slower Self-Discharge: Holds a charge longer when the vehicle is not in use.
• Maintenance-Free: No need to check electrolyte levels.
• Better Performance in Extreme Temperatures: Generally performs better in both hot and cold conditions.
• Enhanced Cycling Capability: Better able to withstand repeated deep discharges, beneficial if you run accessories with the engine off.

For a diesel Ram 3500, which relies on two batteries, upgrading to AGM can provide greater reliability and peace of mind, especially if you tow, haul, or have aftermarket electrical accessories. While not strictly "needed," AGM batteries are a highly recommended upgrade.

Post-Installation Relearn / Reset Procedure

After disconnecting and reconnecting the battery (or installing new ones) on your 2014 Ram 3500, you may experience some minor quirks or warning lights. Most modern vehicles, including the Ram 3500, have computer systems that need to re-learn certain parameters after a power interruption. Here