2023 Mercedes-Benz Metris — Battery Size & Group

Quick answer

• BCI group size: H6 (Group 48, L3)
• Cold Cranking Amps (CCA): target 760–800+ CCA (minimum ~700 CCA; higher is fine)
• Reserve capacity (RC): typically ~120–140 minutes for quality H6 AGM batteries
• Battery type: AGM strongly recommended (OE fitment is AGM); avoid switching to flooded
• Terminal layout: standard SAE top posts; positive on right, negative on left when posts face you (standard H6 orientation)
• Physical dimensions (H6/48): about 11.0" L × 6.94" W × 7.5" H (278 × 175 × 190 mm)
• Dual-battery setup (diesel): Not applicable on North American Metris (gasoline only); single 12V main battery from factory

Replacement battery options

These are popular, readily available replacements in the correct H6/Group 48 size. Use AGM versions for best durability and compatibility. Verify fitment and specs before purchase.

• Interstate H6/Group 48 AGM (760–800+ CCA options)
• DieHard Platinum AGM H6 (Advanced AGM, typically 760–800 CCA)
• ACDelco Gold AGM H6 (premium AGM, ~760 CCA and up)
• Odyssey Performance AGM H6 (high reserve capacity, high CCA)
• Optima YellowTop H6 (deep-cycle capable AGM, strong for upfits)

Note: Part numbers vary by retailer and sub-line; match by “H6/Group 48 AGM.” Do not downsize to H5/47 or upsize to H7/94R unless you have confirmed clearance under the driver seat and cable reach.

AGM vs flooded — which does this vehicle need?

• The 2023 Metris places the main battery under the driver’s seat. Interior-mounted batteries benefit from sealed AGM construction to prevent venting and corrosion. AGM also handles vibration better and supports the Metris’ electrical load (sliding doors, HVAC blowers, inverters/upfits, telematics).
• OE specification is AGM. If the van has added accessories (racks with lighting, inverters, refrigeration, etc.), AGM’s deeper reserve and quicker recharge are advantageous. Avoid switching to a flooded (wet) battery; charging profiles differ and can reduce battery life and system reliability.
• If you must change battery type or capacity from stock, use a capable scan tool to code/register the replacement so the charging strategy matches the new battery.

Post-installation relearn / reset procedure

After reconnecting the battery (negative cable last), perform these normalizations to clear warnings and restore convenience functions:

1. Base relearn/idle: Start engine, let it idle 5–10 minutes with lights and HVAC off. The intelligent battery sensor (IBS) will begin learning state-of-charge; brief drive cycles will complete adaptation.
2. Steering angle/ESP: With the engine running, turn the steering wheel slowly from lock to lock once or twice, then drive straight for a short distance. Any ESP/steering warnings typically clear on their own.
3. Window one-touch: Key on, close each window fully and hold the switch up for 2–5 seconds. Then open fully and hold down 2–5 seconds. Repeat per door with auto-up/down.
4. Power doors/sunroof (if equipped): Run a full open → close cycle to reinitialize.
5. Clock, radio, presets: Manually reset as needed; some settings may be lost during a battery disconnect.
6. Battery registration (recommended if type/capacity changed): Use a professional scan tool (XENTRY-capable) to code the new battery so charge management matches the battery’s chemistry and Ah rating. If you replaced like-for-like AGM H6, the system generally relearns without coding.

Tips:

• The battery is under the driver seat base. Use the designated remote jump/charge posts under the hood for maintaining power if you want to preserve settings during the swap.
• Always support memory with a maintainer when possible, and confirm secure terminal connections and hold-down torque after installation.

Signs of a failing battery

• Slow crank or multiple key cycles needed to start, especially after sitting overnight
• Intermittent warning lights (ESP, ABS, airbag) or “low voltage”/battery messages at startup
• Headlights dimming at idle; blower speed fluctuates with engine RPM
• Strong sulfur or “rotten egg” smell (overcharging/failed cell)
• Repeated jump-starts required or measured resting voltage below ~12.4V after full charge and rest

Common battery issues for this generation

• Parasitic draw from accessories or upfits (inverters, dash cams, telematics, fleet GPS) when the van sits
• Short-trip driving that never fully recharges the battery, leading to chronic low state-of-charge and sulfation
• Installing a non-AGM flooded battery under the seat, causing early failure and potential venting/corrosion
• Loose or improperly routed seat-base battery cables after service; ensure clamps are fully seated and the hold-down is tight
• Intelligent Battery Sensor (IBS) faults or corroded grounds causing inaccurate charge readings and over/under-charging
• Using the wrong group size (H5/47 or H7/94R) without verifying clearance; misfit batteries can strain cables or the hold-down

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