How to Replace the Battery in Your Key Fob

Replacing the battery in your key fob is a simple process that can be done at home with minimal tools. This guide will walk you through the general steps required to replace the battery in your key fob, ensuring that it continues to function properly.

Tools and Materials Needed

  • New Battery: Typically, key fobs use coin-type batteries such as CR2025 or CR2032. Check your vehicle’s manual or the existing battery for the correct type.
  • Small Flathead Screwdriver: A small tool to pry open the key fob casing.
  • Clean Cloth or Tissue: To clean the internal contacts if necessary.

Step-by-Step Guide

  1. Determine the Battery Type
    • Before starting, identify the correct battery type for your key fob. This information can usually be found in your vehicle’s manual or on the existing battery inside the key fob.
  2. Open the Key Fob Casing
    • Locate the seam where the key fob halves meet.
    • Use the small flathead screwdriver to gently pry open the key fob casing. Insert the screwdriver into the seam and twist it carefully to separate the two halves. Be gentle to avoid damaging the plastic casing.
  3. Remove the Old Battery
    • Once the key fob is open, locate the battery. It will be a small, round, coin-type battery.
    • Note the orientation of the battery (which side is facing up). This is important for correctly inserting the new battery.
    • Carefully remove the old battery using your fingers or the screwdriver.
  4. Inspect and Clean the Battery Contacts
    • Before inserting the new battery, check the battery contacts inside the key fob. If there is any dirt or corrosion, clean it gently with a clean cloth or tissue.
  5. Insert the New Battery
    • Place the new battery into the key fob in the same orientation as the old battery. Ensure that it is seated correctly and makes good contact with the battery terminals.
  6. Close the Key Fob Casing
    • Align the two halves of the key fob casing.
    • Press them together until they snap back into place. Ensure that all edges are properly aligned and that the casing is securely closed.
  7. Test the Key Fob
    • Once the key fob is reassembled, test its functions to ensure the new battery is working correctly. Try locking and unlocking your vehicle, and check any other features like remote start or trunk release.

Tips for Success

  • Handle with Care: Be gentle when prying open the key fob casing and removing the old battery to avoid damaging any internal components.
  • Correct Battery Orientation: Make sure to insert the new battery in the same orientation as the old one to ensure proper function.
  • Dispose of Old Battery Properly: Dispose of the old battery according to local regulations, as coin-type batteries can be harmful to the environment.


If your key fob does not work after replacing the battery, consider the following:

  • Check the Battery Orientation: Ensure the new battery is installed correctly.
  • Inspect for Damage: Check for any damage to the key fob casing or internal components during the battery replacement process.
  • Try a Different Battery: It’s possible the new battery is faulty. Try using another new battery of the same type.
  • Reprogram the Key Fob: In some cases, the key fob may need to be reprogrammed after a battery change. Refer to your vehicle’s manual for specific reprogramming instructions.


Replacing the battery in your key fob is a straightforward task that can save you the time and expense of visiting a dealership or locksmith. By following these steps, you can ensure that your key fob continues to function reliably, providing you with the convenience and security you expect.


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