How to change battery in a bmw key fob

Standard key fob batteries typically last for three or four years. Depending on the BMW key fob you have, it may be time for a replacement.

If you have a smart key or comfort access BMW key fob, you’ll need to replace the battery by following these quick steps:

1. Purchase a CR2032 battery from an auto shop or department store. You can expect to pay about $2 for it.
2. Remove the valet key by pressing the tab on your key fob.
3. Use the key or a flathead screwdriver to pry open your battery cover.
4. Remove the dead battery and replace it with the new one.
5. Close your key fob and return the key to its housing.

If you can’t open your key fob because it has an indent in the side, you have a non-comfort access key fob. Since your key fob battery is rechargeable through your car’s ignition, you’ll need to go for a long drive to recharge the battery.

Once you’ve successfully replaced or recharged the battery, be sure to test it out by locking and unlocking the doors a few times. And before you head out again, take a moment to take a look at the Jerry app to find out how much you can save on your car insurance.

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Learn how to replace the BMW key fob battery on almost any BMW key fob. Here you will find several videos and instructions on how you can replace the BMW key fob battery yourself. For more help with your BMW, check out the Vehicle Guides section.

Table of Contents

• Replace BMW Key Fob Battery
• Smart Key Battery Replacement
  • What you will need
  • Procedure
• Comfort Access BMW Key Battery Replacement
  • What you will need
  • Procedure
• Non-Comfort Access Key Battery Replacement
• Diamond Key Battery Replacement
  • What you'll need
  • Procedure
• Applications
• Frequently Asked Questions

Replace BMW Key Fob Battery

Watch a video on how to replace the BMW key fob battery on one of the newest keys designed by BMW. If your BMW doesn’t look like this, check out more videos below on how to replace the BMW key fob battery.

Smart Key Battery Replacement

What you will need

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•  CR2450 battery

This battery is larger compared to a CR2032 battery.

Procedure

You will need to remove the metal blade key from the fob. The metal key can be used as a pry tool to open the key fob.

1. Turn the BMW remote over. Look at the back of your BMW key. The BMW key battery is located under the back cover.
2. Remove the battery cover.
3. Remove the old battery. Lift the battery out of place to remove it.
4. Install the new BMW key battery. Place the new BMW key battery in place of the old battery. Do not force the battery in place. Only apply gentle pressure to the battery.
5. Close the remote. Snap the cover back on the remote.

Comfort Access BMW Key Battery Replacement

This key is used in many BMW models, including 1, 3, 5, 7, X3, X5, and X6 Series.

What you will need

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• CR2032 battery

Procedure

If your key looks like this, but the case won’t open, you may have the non-comfort access version, a built-in rechargeable battery.

For the rechargeable BMW key, see notes in the next section.

1. Remove the valet key from the BMW key fob. The metal key blade can be used to open your car door or trunk in case of an emergency. To remove the valet key, you will need to press the small tab in the keyfob and then pull the valet key.
2. After you remove the valet key, you will notice a small access port on the keyfob. Use the valet key or the flat screwdriver to remove the key battery cover.
3. Once you remove the battery cover, you will see the battery. Remove the dead battery and install the new one. Press the battery cover on the key with your fingers. Reinsert the valet key.

Non-Comfort Access Key Battery Replacement

The BMW key that has the side indent has a rechargeable battery. It wasn’t designed to be serviced. That’s why you can’t open the case. This battery gets charged when it is inserted into the ignition.

If you take short trips, you do not allow enough time for the key to charge. Take at least a two-hour or a longer trip to recharge this BMW key.

If the battery has completely died, typical on a 10-year car, you can open the case, but it will require cutting the key plastic part.

You can replace the built-in battery with a new rechargeable 2032 battery

Diamond Key Battery Replacement

The battery in this key is not designed to be replaced. Yet, replacing the battery in this key is possible by cutting the case and soldering a new battery.

The manufacturer does not recommend this procedure.

What you’ll need

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• VL2020 3 volt battery
• Sharp knife
• Soldering Iron
• Glue

Procedure

1. Start cutting the key shell. It is easier to start at the back of the key. Very carefully cut around the perimeter of the key. Be extremely careful, and avoid cutting yourself. Be careful that the knife doesn’t slide. Do not cut too deep into the case or risk damaging the circuit board.
2. Once the key fob is exposed, the battery is soldered to the circuit board. Use a soldering iron to remove the battery. You could also use pliers or razor blades to cut the terminals soldered to the battery. This is not recommended.
3. Solder the new battery in place. Always pay close attention to the orientation of the old battery. Verify that the positive and negative are oriented the correct way.
4. Carefully put the key back together. Use your favorite glue to glue and seal the key case.
5. Follow the re-initiate instructions below to program your BMW remote.
6. Congratulations! You’re done.

Watch this video if you need to program the diamond BMW key.

Applications

This guide covers all BMW key fobs, including the comfort access key, smart BMW fob, and rechargeable BMW key fobs.

We hope you find the Replace BMW Key Fob Battery the Easy Way guide helpful. Check these troubleshooting and repair guides for more help on your BMW.

Frequently Asked Questions

No. Most BMW key fobs will work after you replace the battery. No programming is needed. The only exception is the rechargeable key and the instructions on how to program that key.

Follow these instructions to re-initiate the key to your BMW. You will need to follow these steps quickly. If you fail to program the key the first time, try again to complete the steps faster.

1. Insert the key into the ignition. Turn it to position II. All the dash lights should turn on, but don’t’ start the car. Only keep the key in position II for one second, then remove the key.
2. Next, press and hold the UNLOCK button. While you hold down the unlock button, press the LOCK button 3 times. All the locks cycle through locking and unlocking on their own.
3. Then turn the key to position II, then off again to finalize the programming.

Some BMW keys have rechargeable batteries that get charged via induction when inserted into the ignition. The rechargeable battery inside the BMW key will eventually stop holding a charge. A common problem if the key is over ten years old.

The BMW dealers will not service these keys. For example, the diamond BMW key. That doesn’t mean that you can’t service these keys yourself. We will show you how to replace the battery even in the diamond BMW key fob. Don’t rush and buy a new key. New BMW keys cost between $350 – USD 600. You can save hundreds by replacing the BMW key fob battery yourself.

BMW uses several battery types in its keyless remote. The most common battery types used in BMW keys are CR2032, 2025, 2020, and 2450.

Has the BMW key fob stopped locking and unlocking the doors? Maybe the key range is not very good. Or you may have a warning symbol on your dashboard. You will get a warning on your instrument cluster saying the remote control battery discharged. To fix these problems, you will need to replace the dead key fob battery. Once the BMW key fob battery dies, the keyless entry remote will stop working. In contrast, you won’t be able to lock/unlock the key with the remote. At least you will still be able to start your BMW. Make sure to use a new lithium battery, as those last much longer.

Yes. Follow the instructions on this page to learn how to change the key battery on any BMW keyless remote.

The most common battery sizes for BMW key fobs are 2020 and 2025.

Follow this tutorial, which shows you how to change the battery on any BMW remote.

Yes. You will need to cut the BMW key open. Then use a soldering iron to remove the old battery.

Your BMW may be damaged. It may be necessary to contact your BMW dealer and ask for advice on how to resolve your issues with a key.

Some BMW models, such as five series E46 and E39, use rechargeable batteries. These batteries last longer, but they may eventually die. They can be replaced but require special batteries.

You have a comfort access key if you do not have to insert the key to start the car. Your BMW is equipped with the Start/Stop button.

If you are experiencing problems with range, the most likely cause is the battery in your key fob needs to be replaced.

Can I replace my BMW key battery myself?

What kind of battery goes in a BMW key fob?

How do I reprogram my BMW key fob after changing the battery?