How to Replace the Battery in a Mercedes Car Key?

[LaIsabela]

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.

[Myron]

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.

[Holly]

I always change the battery carefully to avoid damaging the key. For a Mercedes key, first check the back for any grooves or buttons, then gently press to pop open the back cover, or use a blunt tool like a small screwdriver to slowly pry open the gap. Be careful not to scratch the surface and apply gentle pressure when prying. Remove the old battery and confirm the model is CR2025, then replace it with a new battery of the same type, ensuring the positive side faces up. After putting the cover back on, press firmly to ensure a tight seal. Test the remote function immediately after replacement to confirm it works. If unsure about the steps, it's safest to search for tutorial videos online and follow along. Regularly checking the battery level is recommended to extend the key's lifespan. Taking your time during the process is better to avoid accidental malfunctions.

[McLukas]

Hey, changing the battery in a Mercedes key is super easy. Grab a small tool like a fingernail or a coin, gently pry open the slot on the back of the key—it opens easily. Take out the old battery, remember it's a CR2025 model, don't mix it up. Put in the new battery with the shiny side facing up. Snap the cover back on and press it tight. If it still doesn't work after changing, check the battery orientation or try a new one. When buying a battery, search online for the Mercedes-specific model. The whole job takes just 5 minutes.

[Edgar]

As I'm getting older, I prefer to take my time when replacing the battery. First, hold the Mercedes key and check if there's a button on the back - press it to open the cover, or gently pry open the gap with a soft object. Remove the old CR2025 battery, and when placing the new one, make sure the shiny side faces up and aligns correctly. After putting the cover back, press it firmly with your hand to secure it. Test the unlocking function after replacement. If it doesn't work smoothly, ask family for help or take it to a shop. Remember not to force it open to avoid damaging the parts, and always keep the key in a dry place.