The BMW Car Key Battery Replacement Guide

Is your BMW key fob taking longer to unlock your car or do you have a flashing notice on your dashboard? These are signs that your BMW key is ready for battery replacement. Luckily, changing the battery is a straightforward task. Here’s our simple guide on how to change battery in BMW key fob.

What You Need for BMW Key Battery Replacement

Before you get started, you’ll need to gather a new battery and a small flathead screwdriver.

  • Battery: Most BMW key fobs use a CR2032 or CR2450 lithium battery.
  • Screwdriver: You will need a small flathead screwdriver to open the key case.

Identifying the Correct Battery Type

To find out the exact type, check your vehicle’s manual or inspect the key fob itself. The battery type is often engraved on the back of the fob or inside the battery compartment. Using the correct battery type is crucial for optimal performance, as incorrect batteries might not fit properly or provide the necessary power.

How to Change the Battery on a BMW Key: Step-by-Step

BMW key for battery replacement involves a few simple steps. With the right tools and careful handling, you can complete the task in a few minutes.

BMW 1 Series battery replacement

Step 1: Remove the Mechanical Key

You first need to remove the mechanical key to access the battery. Turn the key over, press the release button, and then pull the key out. This will allow you to open the key fob and reach the battery compartment.

Step 2: Open the Key Case Without Causing Any Damage

To open the key fob case, locate the small groove or slot on the edge of the fob. Insert the flathead screwdriver into this slot and gently push to pry open the case. Be careful to avoid using excessive force to prevent damaging the plastic casing.

Once the case is open, carefully lift the back cover. Take note of how the old battery is positioned, as this will help you insert the new battery correctly.

Step 3: Remove the Old Battery Safely

After opening the case, gently lift the old battery out with the screwdriver. Be careful not to damage the battery contacts, as these are essential for the new battery to work properly.

Make sure to dispose of the old battery properly to ensure safety and protect the environment. Many local  shops and recycling centres accept used batteries.

Step 4: Insert the New Battery

Take the new battery and align it with the contacts inside the key fob. Make sure the positive (+) side of the battery faces the correct direction, as indicated inside the fob.

Press the battery firmly into place. Ensure it is securely positioned to avoid any connectivity issues. Double-check the orientation before closing the case.

Step 5: Securely Close the Key Case

Once the new battery is in place, align the back cover of the key fob with the front section. Press the two halves together until you hear a click. The best way to do this is by clicking the top section of the cover followed by the middle section to ensure it is securely closed.

Common Issues and Troubleshooting

You need to check that the key fob works correctly after replacing the battery. If you encounter any issues, our troubleshooting tips can help resolve common problems.

Testing the Key’s Functionality After Battery Replacement

Test all the buttons on the key fob to ensure they respond correctly. Stand near your car and try locking and unlocking the doors. If it works correctly, you have successfully replaced the battery.

Solutions for Potential Key Problems

If the key fob doesn’t work, open the case and check the battery’s placement. Ensure the battery is seated correctly and the contacts are clean and undamaged. This simple check can often resolve the issue.

If the key fob is still unresponsive after checking the battery, consider the possibility of a defective battery. Try replacing it with another new one. Sometimes, a new battery can solve the problem.

If this doesn’t solve the issue, the key fob might have an internal problem and you may need a BMW replacement car key. An auto locksmith can provide expert help and professional key replacement services.

Maintaining Longevity and Optimal Performance

Regular maintenance of your key fob can extend its lifespan and ensure BMW car key security. Here are our top tips that can help avoid frequent battery replacements and other issues.

Regular Battery Replacement Intervals

It’s recommended to replace the battery every 12 to 18 months, depending on how frequently you use your car. Even if the key fob still works, a new battery ensures reliable operation and prevents unexpected failures. If you notice a decrease in range or responsiveness, it’s a sign the battery might need replacement sooner.

Additional Tips for Key Care and Maintenance

To keep your BMW key fob in optimal condition, follow these additional care and maintenance tips:

  • Keep Your Key Fob Clean: Regularly wipe your key fob with a soft, dry cloth to remove dirt and grime. Avoid using harsh chemicals that could damage the fob’s surface.
  • Avoid Moisture Exposure: Keep your key fob away from water and other liquids. Moisture can damage the internal components and lead to malfunction.
  • Handle with Care: Avoid dropping your key fob as this can affect its functionality and may require professional repair.
  • Store Properly: When not in use, store your key fob in a safe, dry place. Extreme temperatures can affect the battery life and overall performance.


What type of battery is needed for a BMW key?

BMW key fobs typically use CR2032 or CR2450 lithium batteries. Check your vehicle’s manual or the battery compartment for the specific type.

Can I change the battery on a BMW key myself?

Yes, you can change the battery on a BMW key fob yourself. It is a simple process that requires a small screwdriver and a new battery. Follow the steps outlined in our guide.

How often should I change the battery on my BMW key?

You should change the battery every 12 to 18 months to ensure optimal performance. You may need to replace the battery sooner if you notice a change in responsiveness or a signal on your dashboard display screen.

Where can I purchase a replacement battery for a BMW key?

Replacement batteries for BMW keys are available at most electronics stores, automotive shops, and online retailers. Ensure you purchase the correct type, such as CR2032 or CR2450.

Are there any special tools required to change the battery on a BMW key?

You only need a small flathead screwdriver to change the battery.