How to Replace the Battery in a Mercedes Car Key?
2 Answers
The method to replace the battery in a Mercedes car key is as follows: 1. Push the small toothed switch at the end of the remote to the right to remove the mechanical key; 2. Insert a tool into the rear of the keyhole and pry to open the back cover; 3. Press lightly on the battery to remove and replace it. Mercedes models include: Mercedes E-Class, Mercedes A-Class, Mercedes S-Class, Mercedes G-Class, Maybach, etc. Taking the Mercedes E-Class as an example, its body dimensions are: length 5078mm, width 1860mm, height 1484mm. The Mercedes E-Class is equipped with a 1.5t turbocharged engine, with a maximum power of 135kw and a maximum power speed of 5800 to 6100 revolutions per minute.
I've got plenty of experience changing Mercedes key fob batteries. Having driven a Mercedes for nearly a decade, I always replace the key battery myself when it runs out. First, hold the key and look for a small indentation or button on the back—press it and the back cover will pop open. If there's no button, gently pry the edge open with a small tool like an old credit card or coin, being careful not to use too much force to avoid damaging the casing. Remove the old battery, usually a CR2025 coin cell—make sure you don't get the wrong model. When inserting the new battery, place it with the shiny side up (that's the positive pole) and align it properly in the slot. Close the cover and press firmly until you hear a click. After replacing, test the key by pressing the unlock button to see if the light turns on. I recommend buying original or reliable branded batteries—they last one to two years. After replacement, you can use a small tool to apply a bit of sealant to prevent dust. Overall, it's super simple—doing it yourself saves money and gives peace of mind.
