How to Open a Mercedes Car Remote to Replace the Battery?
4 Answers
Mercedes car remote opening and battery replacement method is: 1. Gently press the switch on the back of the key to remove the mechanical key; 2. Press the key back cover opening button on the back of the key to remove the back cover; 3. Push the battery compartment on the left side of the key; 4. Remove the old battery and insert the new one. Mercedes models include: Mercedes GLS, Mercedes GLE, Mercedes GLC, Mercedes GLA, Mercedes CLA, etc. Taking the 2021 Mercedes GLS as an example, it is a mid-to-large-sized car with body dimensions of: length 4988mm, width 1890mm, height 1424mm, and a wheelbase of 2939mm.
Changing the battery in my Mercedes key fob is pretty straightforward, but I should remind you about the details. First, carefully examine the key fob casing – there's usually a small notch or gap along the edge. Use a thin coin or flathead screwdriver to gently pry it open, but don't apply too much force to avoid scratching the plastic. Once the cover is off, you'll see a coin cell battery inside, typically a CR2025 model – be careful not to lose it. When removing the old battery, note the positive terminal orientation, and insert the new battery the same way. When reassembling, align the cover properly and press firmly to ensure no gaps remain. After replacing the battery, test the unlock button – if the car lights don't respond, you may need to resynchronize it by checking the owner's manual or online videos (sometimes requiring button-holding during vehicle startup). I recommend checking the battery level annually to avoid last-minute failures, as Mercedes key fob batteries typically last 1-2 years.
I've replaced the battery in my Mercedes key fob several times myself, and it's quite easy. First, use a soft tool like a plastic card or a small spoon to gently pry open the key fob along the seam on the side—avoid using metal blades to prevent damaging the interior. Once opened, you'll see a small round battery, typically a CR2025 type, which can be easily found at supermarkets or auto parts stores. When replacing the old battery with a new one, make sure the positive side (marked side) faces upward and is securely placed—don't install it backward. Just snap the cover back on firmly, and after replacement, test the key fob by pressing the buttons to check the car lock response. If it doesn't work well, it might be due to the old battery affecting the signal. To prolong battery life, store the key fob in a dry place after use to avoid moisture. Different Mercedes models may have slight variations in key fob design, but the methods are mostly similar. If you can't open it, don't force it—look for online diagrams or guides for reference.
Replacing the battery in a Mercedes key fob is quite simple. First, locate the small slot on the back of the key fob and use your fingernail or a coin to pry open the cover. Inside, you'll find a CR2025 coin cell battery. Remove the old battery and replace it with a new one, ensuring the positive side faces the marked direction. Close the cover firmly and press the buttons to test functionality. Avoid using excessive force to prevent damage. Make sure to purchase the correct battery model (CR2025) to ensure compatibility, as using the wrong type might require reprogramming the key fob if it becomes unresponsive after replacement.
