DIY: Step-By-Step Guide to Mercedes-Benz BGA Key Battery Replacement

Are your Mercedes-Benz vehicle’s doors failing to unlock or lock? Is your SmartKey not working? Most likely, your malfunctioning key means that it’s time for a Mercedes-Benz key battery replacement. Thankfully, replacing a key battery on your own takes only a few minutes.

When a Mercedes-Benz Key Fob Battery Needs Replacement

How do you know if you need a Mercedes-Benz key fob battery change? If you’re due for a car key battery replacement, you’ll notice a few warning signs first:

  • If you notice your vehicle is harder to start and takes multiple attempts, then your key battery could be low.
  • Can you no longer lock and unlock your doors? Are you unable to set off the panic alarm? Those can be sure signs it’s time for a Mercedes-Benz key battery replacement.
  • If a warning sign on your dashboard indicates there’s a problem with your charging system, then you could be due for a new key battery.

Any of these signs can indicate it’s time for a new Mercedes-Benz key battery replacement, and we recommend taking the proactive step to perform a car key battery replacement so you’re not stranded around North Las Vegas.

How to Change a Battery in a Mercedes-Benz Key Fob
When it comes to Mercedes-Benz key fob battery changes, it depends on which Mercedes-Benz key fob you have. Older Mercedes-Benz vehicles have the Mercedes-Benz SmartKey®, while newer models have the Mercedes-Benz Chrome Key. After you determine the key type, you can take the following steps:

How to Replace a Mercedes-Benz Key Battery: SmartKey
Once you acquire two CR 2025 batteries, locate your Mercedes-Benz key:

Step 1: Hold the key in your hand by the keychain.

Step 2: Pull the sliding tab, and pull out the valet key.

Step 3: Move the valet key to the opposite side of where it can be fully inserted, then push down.

Step 4: Remove the key backing, and replace the battery.

Step 5: Reassemble the SmartKey, then test for proper functionality.

How to Change the Key Battery for the Mercedes-Benz Chrome Key

If you own a newer Mercedes-Benz model, chances are you might actually have a Chrome Key. Opening your Mercedes-Benz key and changing the battery differs slightly with the Chrome key:

  • Pull on the bottom tab of the key, away from the rest of the fob. Pull until the key releases.
  • Then, you should see a small gap in the fob where the key was. Press the key into the flat end of the fob to open the Chrome Key’s cover.
  • Once you remove the key cover, you’ll be able to see the battery. Remove the battery, and replace it with the new one while making sure the correct side is facing up.

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