How to Replace the Battery in an Older Mercedes-Benz S350L Key?

[ONova]

Steps to replace the battery in an older Mercedes-Benz S350L key are as follows: 1. Before replacing, it's best to first understand the battery model for the car key, then select a new key battery according to the specified model. 2. Push the marked switch upwards from the tail of the key, and the hidden mechanical key will pop out slightly, allowing you to remove the mechanical key. 3. Still at the tail of the key, use the just-removed mechanical key to press against the marked position, and with a slight force, the key casing can be opened. 4. After removing the key casing, you can see the battery positioned relatively deep inside. Insert an object into the gaps on both sides and gently pry to remove the old battery. 5. Install the new battery, ensuring the positive and negative terminals are not reversed. Then, follow the installation steps: first insert the top of the casing, then press firmly on the other end to complete the battery replacement. Finally, don't forget to reinsert the mechanical key.