Whether you drive a compact A‑Class, a tech‑packed S‑Class, a rugged G‑Wagen, or a family‑friendly GLE, the right battery keeps stop‑start systems happy, modules awake, and the check‑engine light off. Below you’ll find which battery technology (AGM/EFB) suits your Benz, the most‑common sizes (H5/H6/H7/H8), how to install and register it, and smart ways to shop. When you’re ready to compare, see curated searches for H6 / Group 48 AGM, H7 / 94R AGM, H8 / 49 AGM, and Mercedes auxiliary batteries
Table of Contents
- Quick Picks for Mercedes‑Benz Owners (By Use Case)
- Top Battery Types for Mercedes‑Benz (What to Choose & Why)
- Mercedes‑Benz Model‑Specific Buying Tips
- Mercedes‑Benz Battery Fitment Cheat Sheet (Most‑Common Sizes)
- Spec Targets: CCA, RC, and Warranty
- Best Car Battery Brands for Mercedes‑Benz & Where‑to‑Buy
- Mercedes‑Benz Car Battery Installation Guide (DIY or Shop)
- Mercedes‑Benz Car Battery Maintenance & Longevity
- Signs You Need a New Battery
- Contact Mercedes‑Benz Customer Service & Support
- Mercedes‑Benz Car Battery FAQs
Quick Picks for Mercedes‑Benz Owners (By Use Case)
- Modern Benz with start‑stop (most 2010s‑present): Choose AGM (best) or EFB (minimum). Do not downgrade from AGM to standard flooded. Browse AGM best sellers. ~$220–$400
- Luxury/electronics‑heavy models (E/S/GLS/GLC/GLE, short trips): AGM for high charge acceptance and vibration resistance. See H7/94R AGM and H8/49 AGM. ~$250–$420
- Compact Benz (A/CLA/GLA/B) without heavy options: EFB (good) or AGM (better). Check H5/47 EFB or H6 AGM. ~$170–$330
- Cold‑climate owners: Prioritize higher CCA and AGM chemistry. Compare high‑CCA AGM options.
- Hot‑climate owners: Favor batteries with higher RC and heat‑tolerant plates (EFB/AGM). Explore EFB choices.
- Mercedes with auxiliary/backup battery (common on start‑stop): Replace both main and auxiliary if the dash shows repeated battery errors. Shop auxiliary batteries. ~$40–$120 (aux)
- Off‑road/rough roads (G‑Class): AGM H8/49 with strong vibration rating. See H8 AGM.
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Top Battery Types for Mercedes‑Benz (What to Choose & Why)
| Type | Best For | Why It Works | Typical Sizes | Approx. Price | Shop |
|---|---|---|---|---|---|
| AGM (Absorbent Glass Mat) | Start‑stop, heavy electronics, premium models | High charge acceptance, sealed & spill‑proof, strong in cold, vibration‑resistant | H6 (48), H7 (94R), H8 (49) | $240–$420 | Shop H7/94R AGM |
| EFB (Enhanced Flooded) | Light/medium stop‑start, compact models | Reinforced plates for cycling, better than standard flooded under start‑stop | H5 (47), H6 (48) | $170–$300 | Shop H5/47 EFB |
| Flooded/Lead‑acid | Older Benz without start‑stop | Lowest cost; adequate if vehicle never used AGM/EFB | H5/H6/H7 (verify) | $130–$220 | Browse H6 options |
Mercedes‑Benz Model‑Specific Buying Tips
- C‑Class (W204/W205/W206): Commonly H6/H7 AGM depending on engine and options. Budget $230–$380. If you have start‑stop, stick with AGM. See H7 picks.
- E‑Class (W212/W213/W214): Often H7 or H8 AGM. Many trims use an auxiliary battery for stop‑start/brake hold—replace together if warnings persist. $260–$420 main, $50–$120 aux. Shop H8.
- S‑Class (W221/W222/W223): Electronics‑heavy; AGM H8 recommended. Some years use dual/aux batteries. $300–$450 main. Compare H8 units.
- GLA/CLA/A/B‑Class: Typically H5 EFB/AGM or H6 AGM. Tight battery trays—measure before ordering. $170–$320. GLA H5 choices.
- GLC (X253/X254): Usually H6/H7 AGM. Check for trunk‑mounted auxiliary battery. $240–$380. GLC H7 AGM.
- GLE/ML (W166/W167): Often H8 AGM with aux battery. $270–$420. GLE H8 AGM.
- GLS/GL (X166/X167): Large capacity H8 AGM recommended. $290–$450. GLS H8.
- G‑Class (W463): Vibration‑resistant AGM H8/49 is common; off‑roading benefits from higher RC. $300–$450. G‑Wagen H8.
- SLK/SLC/SL: Usually H6/H7 AGM depending on engine bay packaging. $240–$380. SLK H6 AGM.
- Sprinter (bonus): Often H8/49 AGM; some vans use dual batteries. Verify by VIN and equipment. Sprinter H8.
Mercedes‑Benz Battery Fitment Cheat Sheet (Most‑Common Sizes)
| Class / Model (examples) | Common Size (EN/JIS/BCI) | Chemistry | Notes |
|---|---|---|---|
| A/CLA/GLA/B | H5 (Group 47) / H6 (48) | EFB or AGM | Tight tray; confirm height and terminal layout |
| C‑Class | H6 (48) or H7 (94R) | AGM preferred | Many trims include auxiliary battery |
| E‑Class | H7 (94R) or H8 (49) | AGM | Stop‑start & aux battery common |
| S‑Class | H8 (49) | AGM | High RC/CCA recommended |
| GLC | H6 (48) or H7 (94R) | AGM | May use trunk‑mounted aux |
| GLE/ML | H8 (49) | AGM | Aux battery frequent |
| GLS/GL | H8 (49) | AGM | Choose high RC for accessories |
| G‑Class | H8 (49) | AGM | Choose high vibration rating |
| SLK/SLC/SL | H6/H7 | AGM | Confirm vent routing |
| Sprinter | H8 (49) | AGM | Some variants dual‑battery; verify |
Spec Targets: CCA, RC, and Warranty
CCA: Cold Cranking Amps RC: Reserve Capacity Tech: Flooded / EFB / AGM
- CCA: Meet or exceed OE spec; cold climates benefit from +50–100 CCA above the minimum.
- RC: More RC = better support for lights, HVAC, audio, and frequent short trips.
- Technology: If your Benz shipped with EFB/AGM and start‑stop, don’t downgrade to standard flooded.
- Warranty: Target 36+ months free replacement (or regional equivalent) from a name brand.
- Physical fit: European H‑sizes (H5/H6/H7/H8) equal BCI 47/48/94R/49; check terminal orientation and venting.
Best Car Battery Brands for Mercedes‑Benz & Where‑to‑Buy
| Brand Line | Why It’s Good | Typical Warranty | Shop |
|---|---|---|---|
| Premium AGM lines (e.g., H7/H8) | High CCA & RC, robust construction for start‑stop | 36–48 mo | Browse H8/49 AGM |
| EFB lines | Budget‑friendly for lighter start‑stop duty | 24–36 mo | See EFB choices |
| Auxiliary/backup batteries | Prevents recurring stop‑start warnings | 12–24 mo | Shop auxiliary |
- Amazon: Huge selection and fast delivery; filter by your exact size (H6/H7/H8). Watch for fresh stock and reputable sellers.
- Local parts stores: Same‑day pickup and free testing/installation at many locations.
- Mercedes‑Benz dealer: OE‑matched parts and battery registration; pricier but hassle‑free.
How to Check Freshness & Authenticity
- Look for the manufacture date code (stickers or heat‑stamp). Aim for stock < 6 months old.
- Packaging should be sealed; terminals clean with caps; vent plugs present for H‑sizes.
- Buy from sellers with strong reviews and clear return policies.
- On arrival, request a load/CCA test before installing.
Car Battery Warranty Tips
- Prefer free‑replacement terms over pro‑rated only.
- Keep the receipt and record the install date, mileage, and voltage.
- Confirm whether professional installation/registration is required to keep the warranty valid.
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Mercedes‑Benz Car Battery Installation Guide (DIY or Shop)
- Save memory / maintain voltage (recommended): Use an OBD memory saver or a regulated charger in supply mode to keep modules powered.
- Access the battery: Many Benz models place the main battery in the trunk/right‑rear under the floor, or under the hood behind covers. Aux batteries may be behind panels or under dash.
- Safety first: Wear eye protection and gloves. Avoid shorting terminals. Work in a ventilated area.
- Disconnect: Negative (‑) first, then positive (+). If IBS (battery sensor) is present on the negative lead, handle gently.
- Remove hold‑down & vent: Keep brackets and bolts organized. Note vent tube routing (AGM/EFB still vent).
- Match specs: Confirm size (H5/H6/H7/H8), CCA, RC, and chemistry (AGM/EFB). Place the new battery, connect vent tube.
- Reconnect: Positive (+) first, then negative (‑). Torque to spec; avoid overtightening.
- Register/coding: Many Mercedes require battery registration (tell the ECU a new battery is installed). Use a capable scan tool or have a shop/dealer perform it to ensure proper charging strategy.
- Clear warnings & test: Start the engine, check for battery/stop‑start messages, and verify charging voltage ~13.8–14.8V with loads on.
Mercedes‑Benz Car Battery Maintenance & Longevity
- Drive long enough weekly for a full recharge (20–30+ minutes). Short trips are hard on AGM/EFB.
- Use a smart charger compatible with AGM/EFB during storage. See smart chargers.
- Keep terminals tight and clean; protect with dielectric/anti‑corrosion sprays.
- Fix parasitic drains (dash cams, USB adapters) and weak alternators promptly.
- Replace auxiliary batteries at the same time as the main if warnings persist.
Signs You Need a New Battery
- Slow crank, dimming lights, or intermittent start‑stop operation.
- Repeated “Stop Vehicle — Leave Engine Running” or battery/12V system warnings.
- Voltage below ~12.3V after an overnight rest (healthy AGM ≈ 12.7V fully charged).
- Battery older than 4–6 years in normal climates, sooner in extreme heat.
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Contact Mercedes‑Benz Customer Service & Support
- Owner’s Manuals: Find manuals and diagrams in your regional Mercedes‑Benz owners portal or MBUSA Owners.
Mercedes-Benz Car Battery FAQs
How long should a Mercedes-Benz car battery last?
AGM/EFB batteries in modern Mercedes models typically last 4–6 years in moderate climates. Frequent short trips, high accessory loads, extreme heat/cold, or infrequent driving can shorten life to 3–4 years; regular highway use and maintenance charging can extend it.
How much is a Mercedes-Benz car battery?
Expect roughly $220–$380 for AGM sizes (H6/LN3, H7/LN4) and $160–$260 for EFB, plus installation and battery registration costs where applicable. Dealer coding/registration can add $50–$150 depending on region and model.
Do Mercedes-Benz vehicles require battery registration or coding after replacement?
Many late-model Mercedes with an Intelligent Battery Sensor (IBS) and energy management benefit from battery registration/coding so the ECU knows the battery type/capacity and charges correctly, preventing start/stop or warning light issues.
Can I replace an EFB with an AGM in my Mercedes?
Yes—upgrading from EFB to AGM is generally acceptable and can improve durability and charge acceptance. Do not downgrade from AGM to standard flooded on vehicles equipped with start/stop.
Which battery size do most Mercedes use?
Common European sizes are H6/LN3 (≈70Ah), H7/LN4 (≈80Ah), and H8/LN5 (≈95Ah) depending on chassis and engine. Always verify by VIN, owner’s manual, or the existing battery label before purchase.
Why did my start/stop stop working after a battery change?
Start/stop is disabled when state of charge is low or when the system hasn’t learned the new battery. Fully charge the battery, check IBS connectors/fuses, and perform battery registration/coding; normal operation often returns after a short drive cycle.
Can I use a trickle charger on a Mercedes AGM battery?
Use a smart charger/maintainer that is AGM-compatible and connect to the designated under-hood posts. Avoid old unregulated chargers that can overcharge; 4–8A maintainers are ideal for long-term storage.
What are signs my Mercedes battery is failing?
Slow cranking, repeated start/stop deactivation, cluster/infotainment resets, voltage warnings, or abnormal gear selector/power steering messages after startup. A conductance test or load test confirms state of health.
Is there a second (auxiliary) battery in my Mercedes?
Some models have an auxiliary battery for start/stop or backup power (often smaller AGM). Symptoms like “Auxiliary Battery Malfunction” indicate it may need replacement separate from the main battery.
Will a higher Ah rating damage my car?
Choosing a slightly higher Ah within the same physical group and technology is usually fine if it fits and is registered correctly. Never change voltage, polarity, or terminal layout; ensure proper venting and hold-down security.
Weize Platinum AGM Battery BCI Group 48-12v 70ah H6 Size 48 Automotive Battery, 120RC, 760CCA, 36 Months Warranty, Dimensions 10.94" L x 6.89" W x 7.48" H
Weize Platinum AGM Battery BCI Group 47-12v 60ah H5 Size 47 Automotive Battery, 100RC, 680CCA, 36 Months Warranty, Dimensions 9.52" L x 6.89" W x 7.48" H