2020 Ram ProMaster Battery Size & Group

Quick answer

• BCI Group Size: H7/94R
• CCA Rating: 700-800 CCA (minimum, refer to owner's manual for exact spec)
• Reserve Capacity: 130-150 minutes
• AGM vs. Flooded: The 2020 Ram ProMaster can use either AGM or flooded lead-acid batteries, but AGM is generally recommended for its durability and resistance to vibration, especially in a commercial vehicle.
• Terminal Layout: Top post, typically with the positive terminal on the right when looking at the battery from the front.
• Physical Dimensions (approximate H7/94R): 12.4 inches (L) x 6.9 inches (W) x 7.5 inches (H)
• Dual-Battery Setup: Not applicable for standard gasoline ProMaster models. Diesel ProMaster models (if available in 2020, check your specific configuration) would likely use a dual-battery setup, often with Group 31 batteries.

Replacement battery options

When it comes to replacing the battery in your 2020 Ram ProMaster, several reputable brands offer excellent options. Always verify the BCI group size and specifications to ensure a perfect fit and adequate power for your vehicle.

• Interstate: MTP-94R/H7
• Optima: Optima YellowTop H7 (DS46B24R - verify fitment for specific model)
• DieHard: DieHard Platinum H7 AGM (or equivalent flooded H7)
• Odyssey: Odyssey Extreme Series H7-94R (or equivalent)
• ACDelco: ACDelco Professional AGM 94RAGM (or equivalent flooded 94R)

AGM vs. flooded — which does this vehicle need?

The 2020 Ram ProMaster originally came equipped with a standard flooded lead-acid battery. However, due to the demanding nature of commercial vehicles and the potential for frequent starts, accessory use, and vibrations, an absorbed glass mat (AGM) battery is often a superior choice. AGM batteries offer several advantages:

• Improved Durability: They are more resistant to vibration and impacts, making them ideal for vehicles that encounter rough roads or heavy use.
• Longer Lifespan: Generally, AGM batteries tend to last longer than traditional flooded batteries.
• Higher Cranking Power: They often provide more consistent cranking power, especially in cold weather.
• Maintenance-Free: AGM batteries are sealed and do not require water top-offs.
• Spill-Proof: The electrolyte is absorbed in glass mats, preventing spills and making them safer in various orientations.

While a flooded battery will work perfectly fine as a replacement, upgrading to an AGM can provide enhanced reliability and peace of mind for your ProMaster.

Post-installation relearn / reset procedure

After disconnecting and replacing the battery in your 2020 Ram ProMaster, you might experience some minor issues or warning lights. These are typically temporary and can often be resolved with a simple relearn or reset procedure. While the ProMaster's system is generally designed to adapt, here are some common steps:

1. Idle Relearn: After installing the new battery, start the engine and let it idle for 10-15 minutes without touching the accelerator. This allows the engine control unit (ECU) to relearn its idle parameters.
2. Window Express Up/Down Reset: If your power windows' express up/down function isn't working, roll the window all the way down, then all the way up, holding the button for a few seconds at each extreme. Repeat for all windows.
3. Radio/Navigation/Clock Settings: You will likely need to re-enter your radio presets, adjust the clock, and potentially reprogram any navigation system settings.
4. Steering Angle Sensor Calibration (if applicable): In some vehicles, especially if equipped with electronic stability control (ESC), the steering angle sensor may need recalibration. This often involves turning the steering wheel fully to the left, then fully to the right, and then centering it. Consult your owner's manual for specific instructions.
5. Drive Cycle: Driving the vehicle for a short period (15-30 minutes) under varied conditions (city and highway) can help the various modules recalibrate and clear any lingering diagnostic trouble codes.

If any persistent warning lights or issues remain after these steps, it's advisable to consult a qualified technician.

Signs of a failing battery

Knowing the signs of a failing battery can help you proactively replace it before you're stranded. For your 2020 Ram ProMaster, keep an eye out for these indicators:

• Slow Engine Crank: The most common sign. If your engine cranks slowly or struggles to start, especially in cold weather, your battery may be weak.
• Dim Headlights/Interior Lights: When the engine is off, dim lights can indicate a low battery charge.
• Warning Lights: A battery warning light on your dashboard is a clear indicator of an issue with the charging system or battery.
• Corrosion: Excessive corrosion around the battery terminals can impede current flow and is a sign of a compromised battery or charging issue.
• Swollen Battery Case: If the battery case appears swollen or bulging, it often indicates internal damage and is a sign of a failing battery that needs immediate replacement.
• Electrical Gremlins: Unexplained issues with electronics, such as the radio, power windows, or other accessories, can sometimes be traced back to a weak battery.

Common battery issues for this generation

The 2020 Ram ProMaster, like many modern vehicles, relies heavily on its electrical system. Common battery issues for this generation often revolve around:

• Accessory Drain: As a commercial vehicle, ProMasters often have aftermarket accessories (lighting, inverters, charging stations) that can contribute to parasitic drain if not properly installed or monitored.
• Frequent Short Trips: Vehicles used for numerous short trips may not allow the alternator enough time to fully recharge the battery.
• Cold Weather Performance: Batteries naturally lose efficiency in cold temperatures, making a healthy battery even more critical in winter months.
• Vibration: Commercial use often exposes the battery to more vibration, which can shorten the lifespan of traditional flooded batteries. This is where an AGM upgrade truly shines.
• Charging System Issues: While less common than a failing battery, an alternator or voltage regulator issue can mimic battery problems by failing to properly charge the battery.

Regular battery testing and maintenance, especially for commercial use, can help mitigate these common issues and ensure your ProMaster remains reliable.

Find a trusted shop on Repairius.