How to Replace the Battery in an Older Mercedes-Benz S350 Key?

[ZaneFitz]

The method for replacing the battery in an older Mercedes-Benz S350 key is as follows: 1. Eject the mechanical key, insert a tool from the side of the key slot, press the internal gray button, and with the other hand push the rear end of the key upwards. When a gap appears, remove the mechanical key. 2. Take out the rear end by hand to replace the battery. After installing the new battery, reinsert the key bracket, and the key battery replacement is complete. 3. During the replacement process, pay special attention to the battery model. Most Mercedes-Benz key batteries use the 3V CR2025 model.