2020 Mercedes-Benz Metris Battery Size & Group

Quick Answer

• BCI Group Size: H6/48
• CCA Rating: 760 CCA minimum
• Reserve Capacity: 120-140 minutes
• AGM vs. Flooded: AGM recommended (or required for some trims with start/stop)
• Terminal Layout: Typically_B+_ at the front-right
• Physical Dimensions (approx.): 10.9" L x 6.9" W x 7.6" H
• Dual-Battery Setup: Not applicable for this vehicle.

Replacement Battery Options

When it's time to replace the battery in your 2020 Mercedes-Benz Metris, you'll want to choose a reputable brand that meets or exceeds the original equipment (OE) specifications. Here are some popular options:

• Interstate: MT5-48/H6 (or an AGM equivalent like MTX-48/H6)
• DieHard: Platinum AGM Group 48 (H6)
• Optima: Optima does not typically offer a direct-fit H6/Group 48 battery in their traditional RedTop or YellowTop lines. If considering Optima, consult a specialist for alternative fitments that accommodate the Metris's power requirements.
• Odyssey: Odyssey Extreme Series Battery Group 48 (H6)
• ACDelco: ACDelco Gold 48AGMHR (AGM) or 48PST (Flooded)

(Note: Always verify part numbers with your retailer and vehicle specifications before purchase as specific models and trims may vary slightly.)

AGM vs. Flooded – Which Does This Vehicle Need?

The 2020 Mercedes-Benz Metris, especially models equipped with the ECO start/stop function, is designed to use an Absorbent Glass Mat (AGM) battery. While a traditional flooded lead-acid battery of the correct BCI group size will physically fit, it is not recommended for an Extended Flooded Battery (EFB) or AGM-equipped vehicle.

AGM batteries are superior for vehicles with advanced electrical systems, high accessory loads, or start/stop technology because they offer:

• Improved Cycling Capability: Can handle repeated deep discharges and recharges better than flooded batteries.
• Higher Power Output: Delivers more consistent power throughout its discharge cycle.
• Vibration Resistance: The glass mat design makes them more resilient to vibrations, common in utilitarian vehicles.
• Maintenance-Free and Spill-Proof: Sealed design eliminates the need for water checks and prevents acid spills.

Using a flooded battery in an AGM-designed system can lead to premature battery failure, inconsistent electrical performance, and potential issues with the vehicle's charging system. Always opt for an AGM replacement for your Metris.

Post-Installation Relearn / Reset Procedure

After replacing the battery in your 2020 Mercedes-Benz Metris, some systems may require a relearn or reset procedure. This is common due to the vehicle's sophisticated electronics. While the Metris is generally less sensitive than some other Mercedes-Benz passenger cars, it's good practice to be aware:

1. Window Express Up/Down: After reconnecting the battery, you might find that the "auto up" and "auto down" functions for the windows don't work. To reset:
   • Roll each window all the way down and hold the button for 2-3 seconds.
   • Roll each window all the way up and hold the button for 2-3 seconds.
   • Repeat for all windows.
2. Clock/Radio Presets: You will likely need to reset the clock and reprogram your radio stations.
3. Steering Angle Sensor (SAS): While often not necessary on the Metris, some vehicles may require the SAS to be recalibrated. This is typically done by turning the steering wheel full lock to the left, then full lock to the right, and then centering it. A short drive might be needed for the system to fully relearn.
4. Check Engine Light (CEL): If a "Check Engine Light" or other warning lights appear after battery replacement, and they don't clear after a short drive, it may be necessary to have the vehicle scanned with an OBD-II tool to identify and clear any stored codes.

For best results, allow the vehicle to sit for a few minutes after reconnecting the battery before starting it. This gives the systems time to initialize.

Signs of a Failing Battery

Watch out for these common indicators that your 2020 Mercedes-Benz Metris battery might be on its way out:

• Slow Engine Crank: The most obvious sign. The engine sounds sluggish when you try to start it.
• Dim Headlights or Interior Lights: Especially noticeable when the engine is off or just after starting.
• Warning Lights: A battery or charging system warning light on your dashboard.
• Electrical Component Malfunctions: Intermittent issues with radio, power windows, or other electronics.
• Corrosion: White, powdery substance around the battery terminals.
• Swollen Battery Case: A bulging or cracked battery case is a sign of internal damage and should be replaced immediately.
• Frequent Start/Stop Malfunctions: If your vehicle's start/stop system stops working consistently, it often indicates a weakening battery that can't maintain the necessary charge.

Common Battery Issues for This Generation

While the Metris is generally reliable, some common themes can emerge with its battery system:

• Parasitic Draws: Aftermarket accessories or sometimes even factory components can draw power when the vehicle is off, leading to a drained battery. If your battery repeatedly dies even after replacement, investigate possible parasitic draws.
• Short Trip Driving: Like any vehicle, consistent short trips prevent the alternator from fully recharging the battery, especially an AGM battery which prefers a full charge cycle. This can shorten battery life over time.
• Extreme Temperatures: Both extreme heat and cold can significantly impact battery performance and longevity. Mercedes-Benz vehicles are sensitive to proper voltage, and a weakened battery can trigger various seemingly unrelated fault codes.

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