2010–2016 Mercedes-Benz E-Class
By Ray Delgado ✓ Certified Mechanic · Published Sep 21, 2026 · Updated Oct 22, 2026
Save $135 by doing it yourself! Shop cost: $315
Quick answer: 12V Battery Replacement on a 2010–2016 Mercedes-Benz E-Class is rated Moderate and takes about 30-90 minutes. You'll need 2 tools for this job, and parts cost about $180. This guide walks you through the full job step by step, including the mistakes to avoid.
| Part Name | Part Number | Price | Buy |
|---|---|---|---|
| Replacement 12-volt battery for 2010-2016 Mercedes-Benz E-Class Hybrid; verify group size, CCA, terminal layout, and VIN fitment | — | $180.00 | |
| Anti-corrosion terminal protectant or felt washers (optional) Optional | — | $8.00 |
About prices: shown prices are typical retail averages and change frequently; cheaper alternatives may be available. Confirm the current price before buying.
💡 Pro tip: Order all parts at once to save on shipping
Follow these steps carefully
Match the label exactly: Group 48/H6 or 49/H8 (E350 70Ah, E550 95Ah). E350: battery on the right side of the engine compartment. E550: trunk, under the load-compartment floor, right side. Test the old battery under load first.
Set the parking brake, switch the ignition off, and take the keys so the modules go to sleep. Wear safety glasses and gloves — batteries contain acid and produce explosive gas. Radio presets and clock will be lost.
E350: battery under the hood, passenger side. E550: trunk, under the load floor, right side. Behind the driver's-side dashboard sits a small AUXILIARY battery — an "Auxiliary Battery Malfunction" warning means that small battery is the culprit.
If the dash says 'Auxiliary Battery Malfunction', do not touch the main battery — that little aux battery behind the dash is the culprit. I have seen people replace the big battery twice before finding it.
Disconnect the NEGATIVE cable first, then the positive — never let a tool bridge a terminal to the body. Photograph the cable routing and vent-tube placement before removing anything.
Remove the hold-down clamp and lift the main battery straight out — it weighs 40-60 lbs, so lift with your legs. Inspect the tray for rust or acid damage; clean corrosion with a baking-soda solution and a wire brush.
Verify the battery matches: same group size, terminal layout and polarity, equal or higher CCA. Secure the hold-down snugly, then connect POSITIVE first and NEGATIVE last. Tighten clamps without over-tightening; reconnect the vent hose to route gases outside the car.
That vent hose on the trunk-mounted battery is not optional — it routes hydrogen outside the car. I tug-test it after every install, because a loose hose in a sealed trunk is a real hazard.
The W212 documents no scan-tool battery registration for the main battery. Reset the clock and windows, confirm no battery warnings remain, and check idle voltage — roughly 13.5 to 14.8 volts.
Test your repair before closing everything up. If something doesn't work right, double-check your steps.
⚠️ Common Mistakes to Avoid
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