How to change a battery on a vw key fob

Maybe you have to press the button multiple times to get the doors to unlock or perhaps your car battery fob doesn’t have the range it used to. This may be due to a dying battery. If so, a battery change is in order. The process is generally pretty straightforward but it sometimes varies depending on brand or even a model.

Navigation and table of contents

Changing Out the Battery in a Volkswagen Key FOB

For changing a battery in a VW key fob, you will need a CR2032 or CR2025 3V battery. These are circular batteries that look like small discs (generally the same ones that you put in kitchen scales, clock, etc.). You’ll also need a tool to pry out the battery, like a small flat-blade screwdriver.

1. Flip open the key by pressing the metal button.
2. Locate the battery panel of the key, right beneath the Volkswagen logo.
3. From the now-empty key cavity, push up on the panel.
4. Remove the battery panel.
5. Insert the prying tool into slot, apply force.
6. Set aside the old battery.
7. Place the new battery in slot with + symbol facing you.
8. Snap the new battery into place.
9. Replace the battery panel.
10. Close the key.
11. Enjoy your now fully-functioning and working key fob!

Here is a handy video explaining the process.

Toyota car key fob battery replacement

1. Remove the key from the fob. There’s a little metal button right above the key part of your key fob. Press that button, and pull out the key.
2. Open the fob. Fit a small screwdriver or some other flat object into the little slot that the key fits into, and pop open the fob.
3. Remove the green circuit board. Do this gently, so as not to damage the components.
4. Replace the battery. Take note of the kind of battery you need to replace, which should be written on a label on the original battery. You can also find this in your owner’s manual; most Toyota key fobs require a CR 2032 3V. You can find a replacement battery at most electronic stores, or you can order one online.
5. Put the fob back together, and place the key back in the fob.

Mercedes car key fob battery replacement

To open a Mercedes-Benz Chrome Key and replace the battery:

• First, you have to push down on the silver, square-shaped button on the bottom of the key
• Slide off the bottom cover
• Once you separate the cover, you’ll see a small drawer in the fob
• Pull the drawer out and pop off the old battery
• Make sure the new battery is facing the correct way and put it in
• Slide the cover back

What battery does Mercedes key take?

The battery type for your Mercedes-Benz key fob should always be CR 3025 or CR3032. The Smart Key uses two 3-volt CR 2025 batteries while the Chrome Key uses just one.

Ford car key fob battery replacement

• First, you have to push down on the release button at the back of the key – best with your thumb nail
• Pull the key apart
• Once you separate the cover, you will need to pop the central piece off
• Pop the piece out with a coin (or your new battery)
• Make sure the new batteries are facing the correct way and put it in
• Put the batteries in (you will need 2x CR2025)
• Put back the 2 pieces

Vauxhall car key fob battery replacement

Changing the car key fob battery for Vauxhall/Opel is one of the most straightforward ones.

• Open the key
• Open the fob by pushing on both sides of the fob in the gap where the metal key sits
• Pop the battery out using tweezers or something thin and sharp
• Replace the battery (CR2032)
• Close the fob

Kia car key fob battery replacement

• Hold and pull the top metal part of the fob – you will pull out the reserve metal key
• Take a flathead screwdriver and put it into the hole opposite of the key hole
• Turn and wiggle gently to open the fob along the side of the fob
• Once it is open, the circuit board will probably fall out but don’t fret
• Take the screwdriver again and pry the battery out but lifting it out of its place
• Replace the battery (CR2032) and click it back into place
• Return the circuit board and line it with the rubber lining inside the key
• Click the fob cover back into its place

Mini car key fob battery replacement

• Remove the integrated key from the vehicle key by pushing the button and pulling at the same time
• Push the integrated key into the hole to access the battery compartment
• Push the integrated key into the battery compartment and lift the lid
• Lift the battery out
• Insert a new battery (CR2032) – the positive side facing up
• Put lid and the cover back
• Insert the integrated key until it engages

Hyundai car key fob battery replacement

• Remove the key out of the key fob but pushing the button and pulling the key out
• Push in and turn the key into to slot next to the key hole
• The key will pop open – it is best to keep the key buttons facing down so they don’t fall out
• Remove the board cover and the board out
• Remove the battery
• Put the new battery in (CR2032) plus side down
• Put the board and the board cover back
• Put the two halves together
• Slide the key back

Difference between CR2032 and CR2025 battery

The obvious difference between the two battery types would be thickness. The CR2032 is 3.2mm thick while the CR2025 is 2.5mm thick. Because the CR2032 is 0.7mm thicker than the CR2025, it has a slightly higher capacity (mAh) to deliver current to the load – the CR2032 can deliver 225mAh with a thickness of 3.2mm, while the CR2025 only delivers 160mAh with a thickness of 2.5mm.

Can I use a CR2032 instead of a CR2025? Yes, you can use a CR2032 instead of a CR2025. Both batteries share the same voltage. However, the only concern is that the CR2032 is bigger (in depth, not diameter) than the CR2025. So it all comes down to whether the battery compartment that holds the CR2025 can accommodate the CR2032 as well.

Is it still Not Working?

If your car key fob is not working after switching out the battery, then the fob itself could be malfunctioning. There is also a chance that it could be a mechanical issue. There may be ways to fix this yourself, but the easiest way to make sure it’s fixed and done correctly is to have a professional do it for you. Electrical components can be very tricky to repair without proper know-how.