How To Replace A Car Key Battery?

If your car key fob does not unlock your car, the battery is probably dead. Modern cars use remote keys which need working batteries. If the battery is flat, you cannot unlock or start the car. Don’t worry, changing the battery is quick and simple. Follow these clear steps.

Signs Your Car Key Battery Is Dead

Before the battery fully dies, you may notice:

• You need to stand closer to the car.
• The buttons sometimes do not work.
• The doors do not lock or unlock with one press.
• Replace the battery early to avoid getting stuck.

If your car won’t start even after replacing the key battery, there could be other problems. Read about car not starting symptoms and fixes here.

How to Replace a Car Key Battery

1. Find the Right Battery

Check your car’s manual for the battery type. Or open the key and read the battery number inside. Buy the same battery at a shop or order it online.

2. Open the Key Fob

Look for a small screw. Remove it with a tiny screwdriver if needed. Find the notch on the side and gently pry the key open with a butter knife or plastic tool. Do not use sharp tools.

3. Remove the Old Battery

Inside, you will see the battery held by a clip. Carefully remove the clip and lift out the old battery. Note which side is positive (+) and negative (−).

4. Insert the New Battery

Put the new battery in the same position. Match the positive and negative sides. Fix the clip back in place.

5. Close the Key

Press the two halves back together. If there was a screw, put it back and tighten it.

6. Test the Key Fob

Stand close to your car. Press the button to lock and unlock the doors. If it works, you’re done. If not, the key may need reprogramming.

Safety Tips for Changing a Car Key Battery

• Throw away old batteries safely.
• Keep batteries away from kids and pets.
• Wash your hands after handling batteries.
• Never use sharp metal tools near batteries.

Troubleshooting Car Key Battery Problems

If your key fob still does not work:

• Check that the battery is fitted the right way.
• Make sure the contacts are clean.
• Try another new battery.
• If needed, see a car dealer to reprogram the key.

Keep a spare battery at home. This simple step saves you trouble when your car key battery runs low. Also, if you notice your car feels slow when driving, read why cars accelerate slowly and how to fix it here.

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