How to Replace the Remote Battery for a Mercedes-Benz Car?
2 Answers
The method for replacing the remote battery of a Mercedes-Benz car: 1. From the tail of the key, push up the marked switch, and the hidden mechanical key will pop out slightly, then you can take out the mechanical key; 2. Still at the tail of the key, use the just removed mechanical key to press against the marked position, apply a slight force, and the key shell can be opened; 3. After removing the key shell, you can see the battery position is relatively deep, use any object to slide into the gaps on both sides and gently pry to remove the old battery; 4. After installing the new battery, ensure the positive and negative poles are not reversed, then proceed with the installation steps—insert the top of the shell first, then press firmly on the other end to complete the battery replacement, finally reinsert the mechanical key.
Last time I changed the Mercedes key battery myself, it wasn't actually difficult but required some care. Keys vary by model - common types have a small notch on the back of the emblem or a flip cover with the Mercedes logo. Just use a thin plastic card or flathead screwdriver as tools, never metal ones. When prying open the key shell, align with the buckle position and apply some skillful force until you hear a click. Remember the positive/negative orientation when removing the old battery - usually the printed side faces up. For new batteries, I recommend Panasonic CR2032 models available at supermarkets/convenience stores for about 5 yuan. Don't rush to close the cover after installation - test the lock/unlock buttons first. The worst is inserting the battery backwards and frying the circuit board - a friend once forced it and ruined the key completely. Remember to clean the metal contact points in the battery compartment as dust buildup affects signal transmission.
