How to Open and Replace the Battery in a Mercedes Car Key?
3 Answers
Mercedes car key battery replacement method is as follows: 1. Select a new button battery that meets the specified model specifications. 2. Push the switch upwards from the tail of the key to eject the mechanical key, then remove the mechanical key. 3. Use the extracted mechanical key to press against the notch, apply force to pry open the key casing, and then proceed with battery installation. Precautions are as follows: 1. Avoid rough handling or dropping. The internal circuitry of the key has weak impact resistance and is prone to damage from severe collisions. 2. If the remote key gets wet, it may burn out the internal circuitry, leading to malfunction.
I recently helped my elderly neighbor replace the battery in his Mercedes key, and it's actually not difficult. For the blade key, just press the small silver button on the side, pull out the metal key blade, then gently pry open the shell along the seam. The smart key is even simpler - there's a thin groove on the side where you can insert a coin and twist to open it. The key point is to buy the correct battery model - older models use CR2025, while newer ones mostly use CR2032 coin batteries. When installing, make sure not to reverse the polarity - the flat side of the battery should face up, with the printed side down. After installation, test if the buttons light up, and make sure you hear a click when pressing the cover shut to confirm it's properly secured.
Last time I replaced the battery in my car key, I discovered a little trick. The Mercedes logo on the back of the smart key is actually a hidden switch. Press the logo firmly with your thumb while pushing the chrome trim at the bottom outward with your other hand. Never use a screwdriver to pry it open forcefully, as scratches on the casing look terrible. After opening the battery compartment, you'll find the original battery has a small label with the model number - just take a photo with your phone and buy the same type at a hardware store. Before installing the new battery, remember to wipe the metal contacts with a microfiber cloth to prevent poor contact.
