Frequently Asked Questions
Replacing the Battery in Your Mercedes-Benz Key Fob
To replace the battery, follow these steps:
- Find the notch – Look for the small notch that allows you to pry the key fob apart.
- Pry it open – Carefully use a flathead screwdriver to separate the two halves.
- Identify the battery – Locate the battery type; usually, it’s a CR 2025 or CR 2032 coin battery.
- Remove the old battery – Use the screwdriver to gently pop the battery out.
- Install the new battery – Ensure the positive side faces the correct direction and snap it into place.
- Close the key fob – Align the two halves and press firmly until they snap together.
Identifying the Correct Battery for a Mercedes Key Fob
Use these steps to find the right battery:
- Check the manual – Your owner’s manual should specify the battery type.
- Examine the fob – The current battery type is usually printed on the battery itself.
- Dealer advice – Mercedes dealers can also inform you of the correct battery.
Safe Mercedes Key Fob Opening Techniques
Opening without damage:
- Use a purpose-made key fob tool or a flathead screwdriver.
- Insert the tool in the notch and gently twist.
- Avoid excessive force to prevent damage to the casing or internal components.
Expected Costs for Key Fob Battery Replacement
- Battery – The price is usually around $5 to $10.
- Service fee – If a dealership or locksmith assists you, a service fee may be charged.
Troubleshooting Post-Battery Replacement Issues
If your key fob isn’t working:
- Check battery orientation – Ensure the battery is facing the right way.
- Clean contacts – Wipe the battery contacts with a clean cloth to ensure good contact.
- Reset the fob – Some fobs may need resetting; consult your manual for instructions.
Handling a Depleted Key Fob Battery in a Mercedes
When the battery dies: