What you need to do before you start
Replacing a Volkswagen key fob battery takes about five minutes and costs between $5 and $15 for the battery itself. You do not need to visit a dealer — you can do this at home with tools you likely already own. The hardest part is opening the fob without damaging the plastic case.
Before you begin, identify which battery your fob uses. Most Volkswagen key fobs from 2000 onward use either a CR2032 or CR2025 battery. The easiest way to know is to look at the battery currently inside — you will see the model number printed on it. If your fob is dead and you cannot open it yet, check your owner's manual or search online for your specific model year and fob style.
Gather a coin (a flathead screwdriver works too), the correct replacement battery, and a clean, flat work surface. Keep small parts organized so you do not lose the battery cover or internal clips.
Key Takeaways
- Most Volkswagen key fobs use a CR2032 or CR2025 battery that you can buy at any pharmacy, grocery store, or hardware store for under $15.
- The fob opens by inserting a coin into the seam on the edge and twisting gently — do not pry hard or you will crack the plastic.
- Once open, note which direction the battery sits before you remove it, then insert the new one the same way and snap the case closed.
- If your fob still does not work after the battery change, the problem is likely a corroded contact or a broken internal component, not the battery itself.
Opening the fob without breaking it
Look at the seam that runs around the edge of your key fob — this is where the two plastic halves meet. You will see a small slot or indentation on one side. Insert a coin (a penny or dime works well) into that slot and turn it gently, as if you were opening a battery compartment on a toy or remote control. Do not force it. If it does not turn easily, try the other side of the fob — some models have the slot on the opposite edge.
As you turn the coin, the two halves will begin to separate. Once you feel it give, stop twisting and use your fingers to pull the halves apart. The battery compartment is now visible. Inside you will see the battery sitting in a small metal holder or clip.
If the coin method does not work, try a flathead screwdriver instead. Insert it gently into the seam and explore light pressure to pry the halves apart. Again, do not force it — Volkswagen fobs are designed to open this way, and forcing them will crack the plastic and make the fob unusable.
Removing and replacing the battery
Before you touch the old battery, look at how it sits in the holder. The positive side (marked with a + symbol) should be facing either up or down — note this direction. You will need to insert the new battery the same way.
Gently pry the old battery out using your fingernail or the edge of a coin. If it is stuck, try rocking it slightly side to side. Once it is out, check the metal contacts inside the fob for corrosion — they should be shiny and clean. If they look dark, dull, or crusty, wipe them with a clean, dry cloth or a pencil eraser. Corrosion on the contacts is a common reason key fobs stop working even with a fresh battery.
Insert the new battery into the holder with the positive side facing the same direction as the old one was. Press it down gently until it clicks or sits flush in the holder. Do not force it — it should sit snugly without pressure.
Closing the fob and testing it
Align the two halves of the fob so the seam is even all the way around. Press them together firmly until you hear or feel a click. The fob should be solid and not rattle or feel loose. If there is a gap, the halves are not seated correctly — open it again and check that the battery is sitting flat and nothing is blocking the case from closing.
Once the fob is closed, test it by pressing each button while standing near your Volkswagen. You should see the lights flash or hear the locks engage. If nothing happens, open the fob again and check that the battery is inserted correctly and the contacts are clean. If the fob still does not work, the problem is likely inside the fob itself, not the battery.
Where to buy the right battery
CR2032 and CR2025 batteries are sold at nearly every pharmacy, grocery store, and hardware store. Common retailers include CVS, Walgreens, Target, Walmart, and Home Depot. You can also order them online from Amazon or eBay. Prices are usually between $5 and $15 for a single battery, though multi-packs cost less per unit if you need extras.
When you buy the battery, check the package to make sure it matches the model number you found on your old battery. The wrong size will not fit in the holder and could damage the fob if you force it.
What to do if the fob still does not work
If you have replaced the battery and the fob still does not respond, the problem is inside the fob, not the battery. Common causes are corroded contacts, a broken button, or a damaged circuit board. Cleaning the contacts with a pencil eraser or a small amount of rubbing alcohol on a cotton swab sometimes fixes the problem.
If cleaning does not work, you have two options: buy a replacement fob (usually $50 to $150 depending on your Volkswagen model) or take the fob to a Volkswagen dealer to have it repaired. Dealers can reprogram a new fob to your car, but they will charge a programming fee on top of the fob cost. Some independent locksmiths also reprogram key fobs and may charge less than a dealer.
Frequently Asked Questions
Can I use a different battery size if I cannot find the exact model?
No. Using the wrong battery size will either not fit in the holder or will not make proper contact with the terminals. Always use the exact model number printed on your old battery. If you cannot find it, check your owner's manual or call a Volkswagen dealer with your vehicle identification number (VIN) and they will tell you the correct battery.
How long does a key fob battery usually last?
Most key fob batteries last three to four years with normal use. If you use your fob frequently, the battery may drain faster. Some people notice the fob stops working from one day to the next, while others see the range decrease gradually over weeks.
What if I lose a small part when I open the fob?
If you lose the battery cover or a clip, the fob may not close properly or the battery may fall out. Contact a Volkswagen dealer or an independent locksmith — they can order replacement parts or sell you a new fob. Do not use the fob without all its parts, as the battery can fall out while you are driving.
Do I need to reprogram my key fob after changing the battery?
No. Changing the battery does not erase the fob's programming. Once you insert the new battery and close the case, the fob should work when ready without any additional steps.