You can replace a Volkswagen key fob battery yourself in about five minutes with a coin and a new battery
Most Volkswagen key fobs use a CR2032 battery, which costs between $3 and $8 at any drugstore, supermarket, or electronics retailer. The fob itself does not need to be taken apart — you straightforward slide the battery cover off with a coin, remove the old battery, and slide the new one in. The whole job takes longer to find the right battery than to do the replacement.
The steps are the same whether you own a Golf, Jetta, Passat, Tiguan, or most other current Volkswagen models. If your fob is older than 10 years, check your owner's manual or call a Volkswagen dealer to confirm the battery type, because some earlier models used different sizes.
Key Takeaways
- Volkswagen key fobs almost always use a CR2032 battery, which you can buy at any pharmacy or grocery store for under $10.
- The battery cover slides off with a coin — no tools, screws, or disassembly required.
- Insert the new battery with the positive side facing up, which is the side marked with a plus sign.
- Test the fob before you leave the store or put the old battery away, in case you need to swap it back.
What battery your Volkswagen key fob uses
The CR2032 is a round, flat coin cell battery about the size of a dime. It is silver-colored and has a plus sign (+) stamped on one side and a minus sign (−) on the other. If you are not sure which battery your fob needs, look inside the battery compartment — the size and type are usually printed on the cover or on the inside of the fob itself.
You can also check your owner's manual or search online for your specific model year and fob type. If you walk into a pharmacy or electronics store and say "CR2032 for a Volkswagen key fob," the staff will know exactly what you need. These batteries are stocked everywhere because they are used in watches, calculators, hearing aids, and dozens of other small devices.
How to open the battery cover
Look at the seam that runs around the edge of your key fob. You will see a small slot or groove on one side — this is where the cover slides off. Take a coin (a penny, dime, or quarter works fine) and insert it into the slot. Turn the coin gently, as if you were opening a jar lid, and the cover will slide off. Do not force it — if it does not move, you are probably in the wrong spot.
Once the cover is loose, you can usually finish removing it by hand. Set the cover aside somewhere you will not lose it. Inside, you will see the old battery sitting flat in a small compartment. It may be held in place by a small metal clip or spring, or it may sit loose. Either way, it will come out easily with a gentle push or pry with your fingernail.
Installing the new battery
Before you put the new battery in, look at which side is marked with a plus sign. That side should face up — toward the top of the fob, away from the circuit board. Slide the new battery into the compartment with the plus side up. If there is a metal clip or spring, it will hold the battery in place automatically.
Once the battery is seated, slide the cover back on by reversing the steps you used to open it. Insert the coin into the slot and turn it gently until the cover clicks or snaps shut. You should hear or feel a small click when it is fully closed. The fob is now ready to use.
Testing the fob before you leave
Before you put the old battery away or throw it out, test the new one. Stand near your Volkswagen and press the lock and unlock buttons on the fob. You should see the lights on your car flash or hear the locks click. If nothing happens, the battery may be installed backwards or may be defective.
If the fob does not work, open it again and check that the plus side of the battery is facing up. If it is, try swapping in the old battery to see if the fob works with that one. If the old battery works but the new one does not, the new battery may be dead — this is rare but happens occasionally. Take it back to the store and ask for a replacement.
Where to buy a CR2032 battery
CR2032 batteries are sold at pharmacies (CVS, Walgreens), grocery stores (Kroger, Safeway, Whole Foods), electronics retailers (Best Buy, Micro Center), and online (Amazon, eBay). You can also find them at dollar stores, hardware stores, and Walmart. Prices range from $3 to $8 per battery, though some stores sell them in multipacks for less per unit if you want spares.
If you are in a hurry, a pharmacy or grocery store is usually faster than waiting for shipping. Most locations have them in the watch or battery aisle, or you can ask at the pharmacy counter. Bring your old battery with you if you want to show the staff exactly what you need, though the CR2032 is so common that you can usually just ask by name.
When to replace your key fob battery
A CR2032 battery in a Volkswagen key fob usually lasts two to four years, depending on how often you use the fob. You will know it is time to replace it when the buttons stop responding right away or when you have to press them multiple times to lock or unlock the car. Some fobs will also show a low-battery warning on your car's dashboard or infotainment screen.
Do not wait until the battery is completely dead — replace it as soon as you notice the fob is sluggish. A weak battery can also cause the fob to work only at close range, so if you have to stand right next to your car to unlock it, a new battery will likely fix that. Keeping a spare CR2032 in your glove box or at home means you will never be stuck with a dead fob.
Frequently Asked Questions
Can I use a different battery size if I cannot find a CR2032?
No. Using the wrong size battery can damage the fob or cause it to malfunction. CR2032 batteries are inexpensive and widely stocked, so you should be able to find one within an hour at any pharmacy or grocery store. If you cannot find one locally, order it online — it will arrive in one or two days.
Does the battery need to be a specific brand?
No. Any CR2032 battery will work, whether it is made by Energizer, Duracell, Panasonic, or a store brand. Price and brand do not matter — they all last about the same length of time. Buy whichever one is cheapest or most convenient to find.
What should I do with the old battery?
Most pharmacies and electronics stores have battery recycling bins near the checkout or customer service desk. You can also take old batteries to a hazardous waste collection event in your area — check your city or county website for dates and locations. Do not throw batteries in the trash if your area has a recycling program.
Will replacing the battery erase my car's settings or require reprogramming?
No. The key fob battery is separate from your car's memory and settings. Replacing the battery will not affect your car's programming, radio presets, seat position, or any other settings. The fob will work exactly as it did before once the new battery is installed.
What if my fob still does not work after I replace the battery?
If the fob does not work with a new battery, the problem is likely the fob itself, not the battery. The buttons or internal circuits may be worn out. You can buy a replacement fob from a Volkswagen dealer, or you can buy an aftermarket fob online and have it programmed by a dealer or locksmith. Dealer fobs cost more but are may provide to work with your car.