2010–2015 Mercedes-Benz GLK
By Tom Becker ✓ 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 2010–2015 Mercedes-Benz GLK 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 2010-2015 Mercedes-Benz GLK; 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, AGM type, and terminal layout to the label on your old battery before buying — ECO start-stop models in particular require AGM. Slow cranking, start-stop faults, or a battery older than four years are the usual signs.
Park the GLK on level ground, set the parking brake, switch the ignition fully off, and remove the key or fob from the vehicle. Open the hood and locate the battery on the right side of the engine compartment, next to the power fuse box. Put on gloves and eye protection and keep metal tools away from the terminals.
I keep metal tools away from both posts at once. A wrench across the terminals welds itself — I've seen the scars.
Remove any plastic cover over the battery and photograph the terminal positions, hold-down bracket, and vent hose routing. Check both cable clamps for corrosion and confirm the bracket is solid.
Loosen the negative (-) cable clamp nut with a 10mm wrench and lift the clamp straight off the post, tucking it where it cannot spring back. Keep the wrench from touching both posts or any grounded metal while you work.
Unbolt the hold-down bracket and lift it clear, then disconnect the vent hose from the battery. Lift the old H6 battery straight up and out — it weighs around 45 pounds — and set it on the ground, not on painted panels.
Reinstall the hold-down bracket snugly without crushing the case. Set the new H6 AGM battery into the tray in the same orientation and reconnect the vent hose to its port.
Start the GLK and confirm strong cranking with no battery, charging, or start-stop warnings. Expect about 13.5 to 14.5 volts across the terminals with the engine running. Take the old battery to a parts store for recycling.
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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