Open the key fob and swap out the old battery in five minutes
Most Ford key fobs use a coin-cell battery that you can replace yourself without tools or a trip to the dealer. The battery sits behind a removable cover on the back of the fob. You pry open that cover, note which way the old battery faces, drop in a new one the same way, and close it back up. The whole job takes longer to find the right battery size than to do the swap.
The battery type varies by fob model and year. A 2015 Ford Escape uses a CR2032, while some older Fords use a CR2016 or CR2025. Check your owner's manual or look at the battery itself before you buy a replacement — the size is printed on the cell. You can find these batteries at any pharmacy, grocery store, or dollar store for between $3 and $8.
Key Takeaways
- Ford key fobs use coin-cell batteries (usually CR2032, CR2016, or CR2025) that you can buy at any pharmacy or grocery store.
- The battery sits under a removable cover on the back of the fob; pry it open gently with a flathead screwdriver or coin.
- Note which side of the battery faces outward before you remove it, then install the new battery the same way.
- If the fob still does not work after a new battery, the problem is likely a worn button contact or a dead circuit board, not the battery itself.
Locate the battery cover on the back of your fob
Flip the key fob over so you are looking at the back. You will see a seam running around the edge or a small slot or notch on one side. That seam or slot is where the cover separates from the body. Some Ford fobs have a cover that slides off; others have one that pops off when you explore pressure to the right spot.
If you see a small notch or groove, insert a flathead screwdriver or a coin (a dime or penny works) into it and gently twist or pry. Do not force it — the cover is plastic and cracks easily. If the fob has a seam instead, run your screwdriver or coin around the edge until you feel the cover start to lift, then work it off slowly.
Remove the old battery and note its direction
Once the cover is off, you will see the battery sitting in a small metal cradle or slot. Before you touch it, look at which side is facing up. Most coin-cell batteries have a flat side (marked with a minus sign or —) and a raised side (marked with a plus sign or +). Write down or remember which side faced outward, because the new battery must go in the same way.
Pop out the old battery by pressing on it gently or sliding it out of the cradle. If it is stuck, a tiny bit of plastic prying from the edge of the cradle usually frees it. Do not bend the metal cradle itself — it needs to hold the new battery snugly.
Install the new battery in the same direction
Take your new battery and place it in the cradle with the same side facing up as the old one. If the old battery had the plus side up, the new one goes in plus side up. Press it down gently until it sits flat and snug in the cradle. You should hear or feel a small click as it settles into place.
Do not force the battery down. If it does not sit flat, you may have it upside down. Flip it and try again. Once it is in, the metal cradle should hold it firmly without any rocking or movement.
Close the cover and test the fob
Align the cover with the body of the fob and press it down firmly until you hear or feel a click. The seam should be flush all the way around — no gaps or edges sticking up. If the cover does not close all the way, the battery may be in upside down or the cover may be misaligned. Pop it open again and check.
Once the cover is closed, press each button on the fob a few times. If the car locks and unlocks, the battery is working. If nothing happens, open the fob again and check that the battery is facing the right direction and sitting all the way down in the cradle.
What to do if a new battery does not fix the problem
If you installed a fresh battery and the fob still does not work, the battery was not the issue. The most common culprit is worn rubber on the buttons. Over time, the conductive material on the underside of each button wears away, and the button stops sending a signal even though the battery is fine. You can sometimes revive a worn button by cleaning the underside with rubbing alcohol and a cotton swab, but if that does not work, the button pad needs to be replaced.
Another possibility is a dead circuit board inside the fob. If the fob has been dropped, sat on, or exposed to water, the board may have failed. In that case, you will need a replacement fob from a Ford dealer or a third-party supplier. A new aftermarket fob usually costs $30 to $80 and can be programmed by a dealer or sometimes by following a sequence of steps in your owner's manual.
Frequently Asked Questions
What battery size does my Ford key fob use?
Check your owner's manual or look at the old battery itself — the size is printed on it. Most Ford fobs use CR2032, but some older models use CR2016 or CR2025. If you are not sure, take the old battery to a pharmacy or electronics store and they can match it for you.
Can I use a rechargeable battery in my key fob?
No. Rechargeable coin-cell batteries have a lower voltage than disposable ones and will not power the fob reliably. Stick with a standard alkaline or lithium coin-cell battery in the size your fob needs.
How often do I need to replace the battery?
Most key fob batteries last two to four years with normal use. If you use the fob heavily or live in a very cold climate, the battery may drain faster. You will know it is time when the fob stops working from a distance or requires you to press the button multiple times.
Is it safe to replace the battery myself?
Yes. The battery is not dangerous, and there are no electrical hazards. The only risk is cracking the plastic cover if you pry too hard. Take your time, use a soft tool like a coin, and do not force anything.
What if the fob cover will not close after I put the new battery in?
The battery is probably upside down or not sitting all the way down in the cradle. Open the fob again, check that the battery is facing the right direction, and press it down firmly until it clicks. Then try closing the cover again.