How to Replace the Key Battery for Mercedes-Benz C-Class?
2 Answers
Mercedes-Benz C-Class key battery replacement method is: 1. Flip the switch on the back of the key to remove the mechanical key; 2. Press the opening button on the back to open the key cover; 3. Open the battery compartment on the left side of the key, remove the old battery and replace it with a new one. Taking the Mercedes-Benz C-Class 2021 200L Dynamic Sport Edition as an example, its body dimensions are: length 4784 mm, width 1810 mm, height 1457 mm, with a wheelbase of 2920 mm. The Mercedes-Benz C-Class 2021 200L Dynamic Sport Edition is equipped with a 1.5T inline 4-cylinder turbocharged engine, with a maximum power of 115 kW and a maximum power speed of 5700 rpm, matched with a 9-speed automatic manual transmission.
I recently replaced the battery in my Mercedes-Benz C-Class key fob, and the process was quite simple but required patience. Locate the small groove on the side of the key, then gently pry open the casing using a coin or small knife—be careful not to break the clips. Before removing the old battery, note the CR2032 model and the positive/negative orientation to avoid short circuits from incorrect installation. Insert the new battery with the positive side facing up, and when closing the casing, listen for a click to ensure it's secure. Test the remote functions by locking and unlocking the car to check responsiveness. A handy tip I learned is to replace the battery every two years to prevent sudden power loss. Buying batteries at supermarkets or online is much cheaper and saves the hassle and time of visiting a dealership. DIY tasks like this are actually fun and deepen your understanding of your car.
