Open the key fob case to reach the battery

Most Ford key fobs split open along a seam running around the edge. Look for a small slot or groove on the side of the fob — this is where you insert a flat tool to pry the two halves apart. A flathead screwdriver, coin, or plastic pry tool works well. Insert the tool gently into the slot and twist slightly to separate the case without cracking the plastic.

Once the case opens, you will see the battery sitting in a metal holder. The battery is usually a coin-cell type, most commonly CR2032, CR2016, or CR2025 depending on your Ford model year. The battery has a flat side and a domed side — note which direction it faces before you remove it, because you must install the new one the same way.

Key Takeaways

  • Ford key fobs typically split open along a seam on the side, and a flathead screwdriver or coin can pry them apart without damage.
  • The battery type varies by model year — check your owner's manual or the old battery itself to confirm whether you need CR2032, CR2016, or CR2025.
  • The battery must face the correct direction (flat or domed side up) when you reinstall it, so note the orientation before removal.
  • New batteries cost between $3 and $8 at drugstores, supermarkets, and hardware stores, and installation takes less than two minutes.
  • If the fob still does not work after a new battery, the problem may be a worn button contact or internal damage rather than the battery itself.

Identify the correct battery type for your Ford

The easiest way to find the right battery is to look at the old one after you remove it. The battery type is printed on the flat side — you will see a code like CR2032 or CR2016. Write this down or take a photo, because you need the exact same type when you buy a replacement.

If you cannot read the old battery or it is damaged, check your Ford owner's manual — the battery type is usually listed in the key fob section. You can also call a Ford dealership with your vehicle identification number (VIN) and model year, and they will tell you which battery your fob uses. Most Ford fobs from 2010 onward use CR2032, but older models and some specialty fobs use different sizes.

Remove the old battery and install the new one

Once the case is open, gently lift the old battery out of its metal holder. If it is stuck, use a plastic tool or your fingernail to nudge it — avoid metal tools that could scratch the circuit board inside. Set the old battery aside so you can verify the new one matches.

Before you insert the new battery, check the orientation of the metal holder. Most Ford fobs hold the battery with the flat side facing up and the domed side facing down, but some models reverse this. Look at the metal contacts inside the holder — the positive contact (usually a small spring or bump) should touch the domed side of the battery. Slide the new battery into the holder in the same direction the old one faced, then press gently until it sits flat.

Close the case and test the fob

Align the two halves of the case so the seam matches up evenly on all sides. Press the halves together firmly until you hear or feel a click — the case should be snug with no gaps. If the case does not close smoothly, remove the battery and check that it is seated correctly in the holder, then try again.

Test the fob by standing near your Ford and pressing the lock and unlock buttons. You should hear the doors lock and unlock, and you may see the lights flash. If the fob works, you are done. If it does not respond, try pressing the buttons several more times — sometimes a new battery needs a few presses to make full contact. If the fob still does not work after 10 to 15 button presses, the problem is likely not the battery.

Where to buy replacement batteries

Coin-cell batteries are sold at drugstores (CVS, Walgreens), supermarkets, hardware stores (Home Depot, Lowe's), and online retailers. A single battery usually costs between $3 and $8, though buying a pack of two or four is often cheaper per battery. Some retailers sell them in the watch or jewelry section, others in the electronics aisle — ask a staff member if you cannot find them.

You do not need a special tool or installation service — the battery change is straightforward enough to do at home in under two minutes. If you are uncomfortable opening the case yourself, most Ford dealerships and some locksmiths will change the battery for a small fee, usually $10 to $20.

Troubleshoot if the fob still does not work

A new battery fixes most key fob problems, but not all. If your fob still does not work after you install a fresh battery and close the case, the issue may be a worn button contact, water damage, or a broken circuit board inside. Try cleaning the battery contacts with a dry cloth or pencil eraser — sometimes corrosion or dirt prevents good contact even with a new battery.

If cleaning does not help, the fob may need repair or replacement. Contact a Ford dealership or automotive locksmith for a diagnosis. Replacement fobs typically cost $150 to $400 depending on the model and whether you buy from a dealer or a third-party seller, but a new battery is always worth trying first since it costs so little.

Frequently Asked Questions

Can I use a different battery type if I cannot find the exact one?

No. Using the wrong battery size can prevent the case from closing properly, damage the contacts, or cause the fob to malfunction. Always use the exact type printed on your old battery or listed in your owner's manual. If your local store does not stock the right type, order it online — it will arrive within a few days.

How long does a key fob battery usually last?

Most Ford key fob batteries last three to four years with normal use. If you use the fob frequently or live in a very hot climate, the battery may wear out sooner. There is no way to predict exactly when it will die, so keep a spare battery at home once you know which type you need.

What should I do with the old battery?

Coin-cell batteries can be recycled at most drugstores and supermarkets — ask at the customer service desk. Do not throw them in the trash. Some retailers accept old batteries for free, while others may charge a small fee.

Will changing the battery erase my fob settings or require reprogramming?

No. Changing the battery does not erase any settings or require you to reprogram the fob. The fob will work exactly as it did before once you install the new battery and close the case.

What if one button works but another does not after I change the battery?

This usually means the worn button is the problem, not the battery. Try pressing the non-working button 20 to 30 times firmly — sometimes repeated pressure can restore contact temporarily. If that does not work, the button contact inside the fob may be worn and the fob may need repair or replacement.