2013–2019 Mercedes-Benz B-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 2013–2019 Mercedes-Benz B-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 2013-2019 Mercedes-Benz B-Class; 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 group size, capacity, and terminal layout to the label on your old battery before buying — on start-stop models, use an AGM or EFB type as specified. Slow cranking, start-stop errors, or a battery over four years old are the usual failure signs.
Park the B-Class on level ground, set the parking brake, switch the ignition fully off, and remove the key or fob from the car. Open the hood and locate the plastic cover over the battery at the back of the engine compartment. Put on gloves and eye protection. Note: models with ECO start-stop also have a small auxiliary battery under the front passenger footwell carpet — this guide covers the main starter battery only.
Release the clips or fasteners on the plastic battery cover and lift it aside. Photograph the terminal positions, the hold-down bracket, and any vent hose connected to the battery. Check both cable clamps for corrosion and make sure the bracket is not rusted.
I photograph the cable routing before touching anything. On the B-Class the cables barely reach, so getting the routing right matters.
Loosen the negative cable clamp nut with a 10mm wrench and lift the clamp off the post, tucking it where it cannot touch a terminal. Then remove the positive cable the same way. Keep the wrench away from body metal — the bay is tight. Do not bridge the two posts with any tool.
Unbolt the hold-down bracket (13mm on most builds) and lift it clear. Disconnect the vent hose from the battery side. Lift the old H6 battery straight out — it weighs around 45 pounds — and set it on the ground. Inspect the tray for corrosion, clean it with a wire brush and baking-soda solution, and let it dry before the new battery goes in.
Set the new H6 battery into the tray in the same orientation, reconnect the vent hose to its port, and reinstall the hold-down bracket snugly.
Start the B-Class and confirm strong cranking with no battery, charging, or start-stop warnings on the dash. Expect roughly 13.5 to 14.5 volts across the terminals with the engine running. Reset the clock and radio presets. If a start-stop or auxiliary-battery warning persists, have the small footwell auxiliary battery tested as well. Recycle the old battery at a parts store.
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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2013–2019
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