2024 Ram 3500 Battery Size & Group

Quick answer

• BCI Group Size: Group 65 (gasoline engines), Group 31 (diesel engines - dual battery setup)
• CCA Rating: 730 CCA minimum (gasoline), 800-1000 CCA per battery (diesel)
• Reserve Capacity (RC): 120-150 minutes (gasoline), 160-200 minutes per battery (diesel)
• AGM vs. Flooded: Most 2024 Ram 3500 models come with flooded lead-acid batteries from the factory. While AGM batteries offer benefits like increased vibration resistance and longer life, ensure compatibility with your vehicle's charging system, especially if it's not originally equipped with AGM.
• Terminal Layout: Top post
• Physical Dimensions:
  • Group 65 (Gasoline): L: 12.06" x W: 7.44" x H: 7.56"
  • Group 31 (Diesel): L: 13.00" x W: 6.81" x H: 9.44"
• Dual-Battery Setup: Diesel models of the 2024 Ram 3500 come equipped with a dual-battery setup for enhanced starting power, especially in cold weather.

Replacement battery options

• Interstate:
  • Gasoline (Group 65): MTP-65, MTZ-65 (AGM)
  • Diesel (Group 31): MTP-31, MTZ-31 (AGM)
• Optima: Optima RedTop or YellowTop (check Optima's fitment guide for specific Group 65 or Group 31 equivalents)
• DieHard:
  • Gasoline (Group 65): DieHard Platinum AGM Group 65
  • Diesel (Group 31): DieHard Platinum Commercial Group 31 AGM
• Odyssey:
  • Gasoline (Group 65): ODP-AGM65 Extreme Series
  • Diesel (Group 31): 31-PC2150S Extreme Series
• ACDelco:
  • Gasoline (Group 65): ACDelco Professional AGM Group 65
  • Diesel (Group 31): ACDelco Professional AGM Group 31P

AGM vs flooded — which does this vehicle need?

The 2024 Ram 3500 typically comes from the factory with traditional flooded lead-acid batteries. Flooded batteries are generally more affordable and perform well under normal conditions. However, many owners opt for Absorbent Glass Mat (AGM) batteries as replacements.

AGM batteries offer several advantages:

• Vibration Resistance: Crucial for heavy-duty trucks that experience a lot of jostling.
• Deep Cycling Capability: Better able to withstand repeated deep discharges, beneficial if you frequently use accessories with the engine off.
• Leak-Proof Design: Safer and maintenance-free.
• Longer Lifespan: Often last longer than flooded batteries under similar conditions.
• Consistent Power Delivery: More stable voltage output.

If you choose to upgrade to an AGM battery, it's generally a straightforward swap. The charging system in modern Ram trucks is usually capable of handling both flooded and AGM batteries without issue. However, for optimum performance and longevity, some sources recommend letting the vehicle's computer "relearn" the new battery type after installation, as detailed below.

Post-installation relearn / reset procedure

After disconnecting or replacing the battery in your 2024 Ram 3500, it's good practice to perform a basic reset to ensure all vehicle systems operate correctly. Modern vehicles rely on the battery management system (BMS) to monitor battery health and optimize charging.

Basic Reset Procedure:

1. Install the new battery: Ensure terminals are clean and tightened securely.
2. Close all doors and the hood.
3. Turn the ignition to the "ON" position (without starting the engine) for approximately 30 seconds. This allows the vehicle's computer systems to power up and recognize the new battery.
4. Turn the ignition "OFF" for 10 seconds.
5. Start the engine. Let it idle for a few minutes. During this time, the engine control unit (ECU) may relearn idle parameters.
6. Drive the vehicle. A short drive cycle (20-30 minutes of mixed city and highway driving) will help all monitors reset and the BMS to accurately assess the new battery.

Special Note for Diesel Models and Dual Batteries: Ensure both batteries are replaced simultaneously in diesel models. The BMS will manage both. No separate procedure is usually needed beyond the above steps for dual setups.

Signs of a failing battery

Recognizing the signs of a failing battery can save you from being stranded:

• Slow Engine Crank: The engine turns over sluggishly, taking longer than usual to start.
• Dim Headlights or Interior Lights: Especially noticeable when the engine is off or cranking.
• Warning Lights: A battery warning light on your dashboard.
• Corrosion on Terminals: White or blue powdery substance around the battery posts.
• Swollen Battery Case: Indicating internal damage or overcharging.
• Electrical Gremlins: Unexplained issues with electronics, radio presets resetting, or erratic gauge behavior.
• Old Age: Most batteries last 3-5 years. If your battery is older, it's wise to have it tested.

Common battery issues for this generation

While the 2024 Ram 3500 is a robust truck, certain battery-related issues can arise, often related to its heavy electrical demands:

• Parasitic Draws: Aftermarket accessories, sometimes even factory components, can slowly drain the battery when the vehicle is off, leading to a dead battery after sitting for a few days.
• Extreme Temperatures: Both very hot and very cold weather can accelerate battery degradation. Extreme cold significantly reduces a battery's cranking power, while heat can cause internal damage.
• Short Trips: Frequent short drives may not allow the alternator enough time to fully recharge the battery, leading to a chronically undercharged state.
• Factory Battery Lifespan: While generally good, some factory batteries may not last as long as premium aftermarket options, especially with heavy use.
• Battery Sensor Issues (BMS): Though rare, a faulty battery sensor or issues with the battery management system can lead to improper charging or inaccurate battery readings.

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