2014 Ram 2500 Battery Size & Group

Quick answer

• BCI Group Size: Group 65 (gas engines) or H7/94R (diesel engines)
• Cold Cranking Amps (CCA): 750-850 CCA (gas) or 800-900 CCA per battery (diesel)
• Reserve Capacity (RC): 150+ minutes (gas) or 140+ minutes per battery (diesel)
• AGM vs. Flooded: AGM is highly recommended for modern electronics; required for diesel.
• Terminal Layout: Left-hand positive (both Group 65 and H7/94R)
• Physical Dimensions (approximate):
  • Group 65: 12.1" L x 7.5" W x 7.6" H
  • H7/94R: 12.4" L x 6.9" W x 7.5" H
• Dual-Battery Setup: All diesel models (Cummins) use a dual-battery setup for increased starting power and electrical system stability. Both batteries should be replaced at the same time.

Replacement battery options

When it comes time to replace the battery in your 2014 Ram 2500, several excellent options are available. Always confirm the exact fitment for your specific engine and trim level with the parts retailer.

• Interstate:
  • Gas: Interstate MTX-65
  • Diesel: Interstate MTX-94R/H7
• Optima:
  • Diesel: Optima YELLOWTOP DH7
• DieHard:
  • Gas: DieHard Gold 65
  • Diesel: DieHard Platinum AGM H7
• Odyssey:
  • Gas: Odyssey Performance Series 65-760
  • Diesel: Odyssey Performance Series 94R-850
• ACDelco:
  • Gas: ACDelco Gold 65
  • Diesel: ACDelco Gold 94RAGM

AGM vs flooded — which does this vehicle need?

The 2014 Ram 2500, particularly models equipped with the Cummins diesel engine, has significant electrical demands. While base model gas-engine trucks may have originally come with a conventional flooded lead-acid battery, an Absorbed Glass Mat (AGM) battery is a highly recommended upgrade and a necessity for diesel trucks.

AGM batteries offer superior vibration resistance (critical for a heavy-duty truck), better deep-cycle performance, and more reliable power delivery for the extensive onboard electronics found in modern vehicles. For the Cummins diesel models, the dual-battery setup is designed around the consistent and robust power output that two matched AGM batteries provide. Using flooded batteries in a diesel can lead to premature failure and electrical gremlins.

Post-installation relearn / reset procedure

Fortunately, the 2014 Ram 2500 does not require a complex battery registration or relearn procedure with a scan tool. However, disconnecting the battery will reset several electronic modules.

After installing the new battery, you can expect the following:

• Radio presets will be lost.
• The Powertrain Control Module (PCM) will need to relearn its adaptive memory. To expedite this, start the engine and let it idle in Park for a few minutes. Then, take the truck for a 10–15 minute drive with a mix of steady cruising and stop-and-go traffic. This allows the computer to recalibrate fuel trims and idle speed.
• The Electronic Stability Control (ESC) light may illuminate. This can often be resolved by starting the engine and turning the steering wheel all the way to the left, then all the way to the right, and finally back to center. This re-calibrates the steering angle sensor.

Signs of a failing battery

A failing battery in a Ram HD can manifest in several ways:

• Slow Engine Crank: The most common sign. The engine turns over sluggishly, especially on cold mornings.
• Warning Lights: A "Check Engine" light, "Service Charging System" message, or a battery icon may appear on the dash.
• Electrical Gremlins: Flickering lights, a radio that won't turn on, or erratic behavior from power windows can all point to an unstable power supply.
• Visible Corrosion: Heavy, fuzzy buildup (usually white or blue) on the battery terminals indicates leaking acid and a poor connection.
• Swollen Case: If the sides of the battery are bulging, it's a sign of internal damage and overheating. Replace it immediately.

Common battery issues for this generation

The 2013–2018 generation of Ram HD trucks are robust, but they are not without common battery-related issues. The primary concern is the high electrical demand, which can shorten the life of even premium batteries. Parasitic drains—where a module or component continues to draw power after the truck is turned off—can be a problem. The factory radio and trailer brake control module have been identified as potential culprits in some cases. If you find your batteries are dying repeatedly, even after replacement, having a technician perform a parasitic draw test is a wise diagnostic step.

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