Open the key fob and swap out the old battery in about two minutes
Most Ford key fobs use a coin-cell battery that you can replace yourself without tools or a trip to a dealer. The battery usually lasts three to four years, and when it dies, the fob stops locking and unlocking your car from a distance. You can buy a replacement battery at any drugstore, grocery store, or hardware store for two to five dollars, and the swap takes less time than it takes to find your keys.
The exact battery type depends on your Ford model year and fob design, but the process is nearly identical across all of them. This guide covers the two most common fob styles you will encounter: the flip-key design (where a metal key slides out) and the flat rectangular design (where the key is built in). Both open the same way, and both use batteries you can find anywhere.
Key Takeaways
- Ford key fobs almost always use CR2032 or CR2025 coin-cell batteries, which cost two to five dollars and are sold at pharmacies, grocery stores, and hardware stores.
- You can open most Ford fobs by locating the seam on the edge, inserting a coin or flat tool, and gently twisting to separate the two halves.
- Note which side of the battery faces outward before you remove it, because the new battery must sit the same way or the fob will not work.
- If your fob does not open with gentle pressure, check the Ford owner's manual or your fob's back label for the correct battery type and opening method.
Identify your battery type before you buy a replacement
The battery type is printed on a label on the back of your fob or inside the owner's manual. The two most common types for Ford fobs are CR2032 and CR2025. Both are coin-shaped, about the size of a dime, and cost the same amount. The difference is thickness: CR2032 is slightly thicker, and using the wrong one can prevent the fob from closing properly.
If you cannot find the label or manual, take the fob with you to the store. Any pharmacy or electronics counter can tell you the correct battery by looking at the fob itself. Do not guess—buying the wrong size wastes money and time. Once you know the type, buy one battery. You only need one, and having a spare is not necessary unless you want to keep one in your car.
Locate the seam and open the fob carefully
Look at the edge of your fob for a thin seam that runs around the perimeter. This seam is where the two plastic halves meet. On most Ford fobs, the seam runs along the side or the bottom edge. Run your fingernail along the edge until you feel where the two pieces separate slightly—that is your opening point.
Insert a coin (a penny or dime works well) or a flat plastic tool into the seam. Do not use a sharp metal tool like a screwdriver, because it can crack the plastic or damage the electronics inside. Gently twist the coin to pry the two halves apart. You are not forcing it open—if you meet strong resistance, you may be at the wrong spot. Try another section of the seam. Once the halves separate, you can pull them apart by hand.
Remove the old battery and note its position
When you open the fob, you will see a small circuit board with the battery sitting in a shallow metal holder. Before you touch anything, look at which side of the battery faces up. The side facing you is either marked with a plus sign (+) or a minus sign (−). This matters: your new battery must sit the same way, or the fob will not work.
Gently pry the battery out of its holder using your fingernail or a plastic tool. Do not use force. If the battery is stuck, try lifting from the edge rather than the center. Once it is out, set it aside. Do not touch the circuit board or any other parts inside the fob. If you see corrosion (a white or blue crusty buildup) around the battery holder, wipe it away with a dry cloth before inserting the new battery.
Insert the new battery with the correct side facing up
Take your new battery and place it in the holder with the same side facing up as the old one. If the old battery had the plus sign facing you, the new one should too. Gently press down until you hear or feel a small click—the battery should sit flat and snug in the holder. Do not force it. If it does not sit flat, you may have it upside down. Flip it and try again.
Once the battery is in place, close the fob by pressing the two halves together. You should hear a click when they snap back into place. If they do not close smoothly, the battery may be the wrong size or sitting at an angle. Open it again and check the position. The fob should close with light pressure—never force it.
Test the fob before you put it away
Stand near your car and press the lock button on the fob. You should hear the locks click and see the lights flash. Press the unlock button and listen for the locks to open. If both buttons work, the battery is installed correctly and you are done. If nothing happens, open the fob again and check that the battery is sitting flat and facing the right direction.
If the fob still does not work after you have checked the battery position twice, the problem may be something other than the battery. The circuit board could be damaged, or the battery contacts could be corroded. In that case, take the fob to a Ford dealer or a locksmith who can test it and tell you whether it can be repaired or needs to be replaced.
Frequently Asked Questions
Can I use a different battery type if I cannot find the right one?
No. CR2032 and CR2025 are not interchangeable. Using the wrong size can prevent the fob from closing, damage the contacts, or cause the battery to drain quickly. Buy the correct type. Any store that sells batteries can order one for you if they do not have it in stock.
What if the fob does not open when I twist the coin?
You may be at the wrong spot on the seam. Try a different section of the edge, or check your owner's manual for the exact opening method—some older Ford fobs have a small button or latch instead of a seam. If you still cannot open it, a locksmith or Ford dealer can do it for you.
How long does a new battery last?
Most Ford key fob batteries last three to four years with normal use. If you use the fob very frequently, the battery may last two to three years. There is no way to predict the exact lifespan, but you will notice the range getting shorter before the battery dies completely.
Do I need to reprogram the fob after changing the battery?
No. Changing the battery does not erase the fob's programming. Once the new battery is in and working, the fob should lock and unlock your car the same way it did before. If it does not work after the battery change, the programming may have been lost, and you will need to reprogram it using your owner's manual or a dealer.