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Replacing a battery in a Mercedes key fob does not require much time and can be easily done in several minutes. What is required is simply the correct kind of battery and some kind of small tool to pry open the case. One of the best things about replacing a battery yourself is that it is an easy process where you do not have to visit the dealership.
Your Mercedes key fob is run by a small coin battery. This battery will weaken over time. Replacing the key fob battery when it is low can be indicated by slower access, a shorter distance, or a warning signal that is showing on the dashboard. Changing the battery in a short period saves you the hassle of being locked out or the inability to start your vehicle.
The key fobs on most Mercedes vehicles have a CR2025 or CR2032 coin cell lithium battery. You may find these batteries at most stores or online. The actual type of battery to use may always be found in your owner’s manual, though you can end up with a generic battery, making it a good idea to always check your owner’s manuals.
Step by Step How to Replace the Battery
At the back of your Mercedes key fob is a little release switch. Pull this switch to get out the metal key. This emergency key is primarily used in case of an emergency, but it also comes in handy for unlocking the battery lid.
You can check what the key was in after taking the key out. You will notice a little hole. Inserting the end of the metal key or a flat object into the hole, one should gently twist it. This will open the cover to the battery compartment.
With the cover open, detach the old coin battery carefully. It can have an easy movement, or another may require a small nudge using a finger or object. Note the position the battery was placed in to get the new one positioned correctly.
Insert your new battery, CR2025 or CR2032, into the slot with the positive end up. Apply a small amount of pressure to press it down until it is seated in place.
Fit the cover of the battery back in place and replace the metal key. Then, use the buttons of your key fob to check that all is working fine. When all the lock and unlock operations are immediate, the replacement was completed successfully.
Frequency of Changing Battery
The battery in a Mercedes key fob should last up to 2 years. The preset lifespan takes into account the frequency of use of your vehicle. If you use your car every day, then you might change the battery more frequently than someone who uses it less frequently.
When the battery replacement fails to do the trick, chances are that your key fob has an additional problem. There are times when the circuit board or circuit chip within fails. This time, it is better to deal with a visit to a Mercedes dealership or an expert locksmith.
A1: The most common batteries used in Mercedes key fobs are a CR2025 or CR2032 lithium coin cell. To make sure the type is correct, check your manual.
A2: Decreased range, slow response, or a warning on a dashboard are typically the common signs of it.
A3: In a few minutes and with some simple steps, you will be able to replace the battery yourself.
A4: The lifespan of the battery consists of one to two years on average, depending on the use of the vehicle.
A5: The first thing that you need to do is make sure that the battery is in its right position. When it fails to work even after this, then the fob should be taken for repair or replacement.