It can be exceptionally frustrating to be stuck with a dead car key battery, particularly if you have no idea of how to change it.
If you own a recent Mercedes model, you may see a message displayed on your instrument cluster reading “Replace Key Battery” when the charge in your fob is running low, so you’ll know when it’s time to act before it dies completely.
Here’s a quick guide created by Dronsfields to help you change your Mercedes key fob battery yourself.
You Don’t Need to Go to a Specialist
How much does it cost to replace a Mercedes car key? Many people are quoted a good £150 or more! Because of this, we reckon it’s best to carefully change your car key battery at home.
Follow These Simple Steps:
Step 1: Get a new battery from a reputable dealer in good time
Make sure your fob battery isn’t going to run out before the new one arrives. Order from a supplier you trust. Be sure to look up the exact type of battery you need first, to avoid making a time consuming mistake. You’ll usually find that it’s a CR 2025 3V, but, depending on the model of your vehicle, it’s always worth checking.
Step 2: Find a flat surface with a lot of light
You need to make sure that you can’t lose any parts of your key fob as you change it, so find a place where you can see all of your surroundings properly. It’s often best to work over a desk or table.
Step 3: Push the release button and pull out the valet key
At the broader “top” end of the fob, you’ll find a release button that you can push down to allow you to access a small key. The key can be found next to it on the right hand side as you look at the logo face of the fob. Pull this key out.
Step 4: Push the key part way back into the hole to remove the back panel
At the very top of the plain black panel, on the inside of the key’s body, there is a small tab. Use the tip of the key to gently probe part way into the slot you pulled it from, until it makes contact with this tab. Gently push the tab up until you can see a gap between the silver cap of the key and the edge of the black panel. Carefully use your fingernail or another firm, slim instrument to slide into this gap and make the panel release.
Step 5: Remove and safely dispose of the dead battery
You should now have exposed the battery you wish to replace. This should be easy to remove. Take note of which side was facing you when you removed it. Be sure to place the battery somewhere from which you’re unlikely to pick it up to accidentally re-use, and keep it there until you’re able to find a suitable means of disposal (many recycling collection points will take batteries).
Step 6: Pop in the new battery
Make sure you put the new battery in the right way round! It should just clip into place. You can then slide the panel back over the top, and insert the key back into its slot.
There you have it! Your key fob should be fully functional again.
For further Mercedes troubleshooting or further information regarding replacement parts, simply contact Dronsfields today on 0333 240 1020 or email info@dronsfields.com.