How to Replace the Battery in a Mercedes-Benz C63 Key?
2 Answers
Mercedes-Benz C63 key battery replacement steps are: 1. Press 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 to see the battery; 4. Use a small flat-head screwdriver to remove the depleted battery; 5. When installing the new battery, ensure the positive side faces up; 6. After battery installation, check if the key functions properly. The Mercedes-Benz C63 key has three buttons: door unlock, lock, and trunk release. Its hidden key functions are: 1. Press and hold the unlock button to lower all four windows simultaneously; 2. Press and hold the lock button to raise all four windows together.
Last year, I helped a friend replace the key battery for a Mercedes C63, and it was actually quite simple. There's a small gap on the back of the key—use a coin or a small screwdriver to gently pry it open, being careful not to apply too much force to avoid scratching the plastic casing. Inside, you'll find a coin cell battery, model CR2032, which is commonly available at supermarkets or online. When removing the old battery, pay attention to the positive and negative markings to avoid installing the new battery backward. Insert the new battery with the '+' side facing up and press it in lightly. Close the casing until you hear a click, then test the lock button—if it lights up, you're done. In daily use, avoid tossing the key around carelessly. The battery typically lasts about two years, so replace it promptly if you notice weak signals instead of waiting until it's completely dead. Opt for high-quality batteries like Panasonic or Energizer—they're durable and reliable, saving you a lot of hassle.
