How To Replace Mercedes-Benz EQS SmartKey Battery

2 min read

Mercedes eqs key

When Mercedes-Benz comes to mind, some may make the connection to the first automobile back in 1886 by Carl Benz. Over the past 140 years, this company grew to a multi-billion-dollar company with a revenue of over $133 billion in 2021.
Mercedes’ humble beginnings have flourished. It has become the go-to brand for luxury vehicles and quality in south Germany.
Mercedes recently also jumped on the bandwagon to produce electric cars. The EQS is their new flagship vehicle.
No matter how advanced and futuristic your car is, even the newest vehicles require keys (of some sort or other). And when these key batteries run low or die entirely, they must be replaced.
This article explains how to change your Mercedes EQS key battery. You’ll find all the information you need in your owner’s manual.
(Remember, if in doubt, go to a local locksmith. It should be at most $20 or $30.)

How should I replace the Mercedes EQS key battery?

You have three options when it comes to replacing your Mercedes EQS SmartKey battery:

  • Visit a Mercedes dealer; or
  • Visit an independent locksmith; or
  • Replace it yourself.

If you’re wary of working on your own Mercedes EQS key, it’s best to use a trusted third party. A local locksmith can do this job for you in moments. Expect to pay no more than $30 or so.
If you go to a dealership, it might be slightly more.
Overall, heading to a local locksmith is often the best option. Ensure their work comes with a guarantee or warranty, though. This will be the quickest and most efficient way to replace your Mercedes EQS key battery.

Can I replace the battery in my Mercedes EQS SmartKey?

You still have the option of fixing it yourself, as shown in the owner’s manual. However, remember to be careful. Watch out for the following:

  • Button cell batteries can be fatal if ingested.
    • They take a couple of hours to kick into effect.
    • If you, someone else, or an animal swallows one (new or old), go straight to the nearest hospital.
  • Be careful to avoid scratching the key casing.
  • Don’t lose any components.
  • Be aware of choking hazards for small children or animals.
  • If you can’t get the EQS SmartKey to securely fasten back together, don’t use it. Go to a dealer or local locksmith.

How to replace Mercedes EQS key battery

Here are the steps you need to take to replace your SmartKey battery.

  1. Turn the key around so that the logo faces down.
  2. Press the small button to pull out the emergency key at the top.
    • This button is located at the bottom of the SmartKey, indented in the center.
  3. Once entirely removed, use the key tip to remove the plastic key cover.
    • Press the key into the opening revealed by the emergency key’s removal.
    • The hole is on the other side to where the emergency key blade usually sits.
    • You may need to apply a little force here, but don’t overdo it.
    • The cover should come off easily.
  4. There is a covered section in the now-exposed central part. The battery sits behind this. Place the emergency key tip in the hole to prise this covering open.
  5. With the cover open, remove the battery.
    • Turn the SmartKey over and tap it against your palm. The button cell battery will eventually fall out.
    • Don’t prise the battery out with anything metal!
  6. Remove the battery from its case and look for the letters imprinted on the top. These should say CR2032.
  7. Put the battery out of reach of children and animals. Ensure you don’t lose it!
    • Batteries must be disposed of at dedicated centers.
  8. Insert the new battery into its bracket with the positive side facing up. The battery should sit firmly and not fall out easily.
  9. Put the cover back on without applying excessive force.
  10. Return the emergency key until you hear it click into place.
  11. Check to see if the key works.

What if it still doesn’t work?

This should solve your problem.
If the key still doesn’t work, there may be a more complex problem with the key transponder or the EQS’s receiver or battery. You’ll need to head to a Mercedes mechanic for an in-depth diagnosis.
(If there’s a problem with the 12-Volt battery, you may notice other issues with the alarm, headlights, infotainment system, power windows, folding mirrors, heated seats, etc.)

Longevity of your Mercedes EQS key

While opinions differ, your SmartKey should last at least three to four years, if not longer. If you need to change it every few months, something is wrong.
Until then, enjoy your ride! Remember to read your owner’s manual for detailed information about replacing your Mercedes EQS SmartKey battery!

owners manual

By Ben Kitchen Ben is a qualified car mechanic with experience working in the industry. He now works as an automotive author, writing about all things vehicle-related. He’s excited about the potential held by electric cars of all shapes, sizes, and types.

Ben Kitchen Ben is a qualified car mechanic with experience working in the industry. He now works as an automotive author, writing about all things vehicle-related. He’s excited about the potential held by electric cars of all shapes, sizes, and types.

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