How to Easily Replace the Battery in Your BMW Key Fob for 3 Series Models

Ever found yourself stranded outside your BMW, frantically pressing the key fob, only to realize it’s the battery that’s let you down? Don’t worry, we’ve all been there. But fear not, because in just a few simple steps, you can replace the battery in your BMW 3 Series key fob all by yourself. No need to rush to the dealership or call for help – you’ve got this!

Picture this: you’re out running errands, your hands full of bags, and suddenly your key fob stops working. Frustrating, right? That’s where knowing how to replace the battery comes in handy. In this article, we’ll walk you through the process step by step, making it easy for you to get back on the road without any hassle. Stay tuned for a quick and hassle-free solution to your key fob battery blues.

Step 1: Gather the Necessary Tools

When replacing the battery in your BMW key fob 3 Series, it’s essential to have the right tools on hand. Here’s what you’ll need:

  • New CR2450 3V lithium coin cell battery
  • Small flathead screwdriver or plastic pry tool
  • Tweezers (optional but helpful)
  • Clean cloth to protect your fob from scratches

Before you start the battery replacement process, ensure that you have these tools readily available. This preparation will make the task smoother and more efficient.

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Step 2: Locate the Battery Compartment

When it comes to finding the battery compartment in your BMW key fob, the process is quite straightforward. Here’s what you need to do:

  • Examine your key fob: Look for a small crevice or a seam along the edge.
  • Use a flathead screwdriver or a plastic pry tool: Gently insert the tool into the seam and carefully pry open the key fob.
  • Be patient: Take your time to avoid damaging the key fob during this step.
  • Once open: Locate the battery compartment inside the key fob.
  • Avoid using excessive force: The key fob should open easily with the right technique.

Remember, locating the battery compartment is a crucial step in the process of replacing the battery in your BMW key fob. By following these simple steps, you can access the battery compartment with ease and move on to the next stage of replacing the battery.

Step 3: Remove the Old Battery

When replacing the battery in your BMW key fob, removing the old battery is a crucial step to ensure a successful replacement process. Here’s how you can easily remove the old battery without any hassle:

  • Find the battery: Look for the old battery within the compartment. It’s usually a small, round battery that needs to be replaced periodically.
  • Gently remove: Use a small tool or your fingernail to gently pry out the old battery. Be careful not to damage the battery contacts.
  • Dispose properly: Ensure you dispose of the old battery safely and appropriately to avoid any harm to the environment.
  • Check for any corrosion: Before inserting the new battery, check for any signs of corrosion on the battery contacts. If you notice any, clean them before proceeding.

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Now that you’ve successfully removed the old battery, you’re one step closer to completing the key fob battery replacement process for your BMW 3 Series.

Step 4: Insert the New Battery

Now that you’ve successfully removed the old battery, it’s time to insert the new one into your BMW key fob. Follow these simple steps to complete the battery replacement process smoothly:

  • **Ensure the new battery is the correct type and size for your BMW 3 Series key fob.
  • Insert the new battery into the designated slot, making sure the positive (+) and negative (-) ends are facing the right way.
  • Gently push down on the battery to secure it in place without applying too much pressure.
  • Double-check that the battery is properly inserted and sitting securely before proceeding further.
  • Avoid touching the battery terminals to prevent any interference with the battery’s performance.

By following these steps, you’ll be one step closer to enjoying a fully functional BMW key fob with a fresh battery.

Step 5: Reassemble the Key Fob

Now that you have successfully replaced the battery in your BMW key fob, the final step is to reassemble the key fob to its original state. Follow these simple guidelines to complete the process effortlessly:

  • Place the Key Fob Cover: Line up the cover with the key fob and press gently until you hear it click into place.
  • Reinsert the Key Blade: Slide the key blade back into its slot if you removed it during the battery replacement.
  • Test the Key Fob: Ensure that the buttons on the key fob are working correctly by pressing them to lock and unlock your car.

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By following these steps, you’ll have your BMW 3 Series key fob fully reassembled and ready to use.

Key Points
Always handle the key fob with care during reassembly to avoid damaging any components.
Testing the key fob functionality after reassembly ensures that the replacement was successful.


Now that you’ve successfully replaced the battery in your BMW key fob, it’s important to reassemble it with care. Remember to place the cover back on securely, reinsert the key blade if you removed it, and test all the buttons to ensure everything is working properly. By following these simple steps, you can keep your BMW key fob in top condition and avoid any issues with its functionality. Happy driving with your newly refreshed key fob!

Frequently Asked Questions

1. How do I reassemble a BMW key fob after replacing the battery?

After replacing the battery, place the key fob cover back on carefully, reinsert the key blade if removed, and test the buttons to ensure functionality.

2. Why is careful handling important during the reassembly process?

Careful handling is crucial to prevent any damage to the key fob components, ensuring it functions properly after reassembly.

3. What is the significance of testing the key fob after reassembly?

Testing the key fob confirms that the replacement battery has been installed correctly and that the key fob is functioning as expected.

Battery industry professional with 5+ years of experience. Bachelor of Science in Electrical Engineering from Georgia Tech. Specializes in power systems and renewable energy.

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