How to Replace the Battery in a Mercedes-Benz C Key?
2 Answers
The method to replace the battery in a Mercedes-Benz C key is as follows: 1. First, locate the sliding switch on the car key, slide to open the mechanical key, and after pulling out the mechanical key, you can see the inside of the car key; 2. Use the metal key you just pulled out to pry open the car key cover, and the car key will be divided into 3 parts, allowing you to see the battery; 3. Remove the old battery, install the new battery, and then cover the car key's lid. The Mercedes-Benz C is a mid-size sedan produced by Beijing Benz, featuring multi-link independent suspension at both front and rear. In terms of body dimensions, the car measures 4784mm in length, 1810mm in width, and 1457mm in height, with a wheelbase of 2920mm. Power-wise, the Mercedes-Benz C is equipped with a 1.5T turbocharged engine, and the transmission system is matched with a 9-speed automatic manual transmission.
My Mercedes-Benz C key fob ran out of battery and the buttons stopped responding. I just replaced the battery myself, and it was quite simple. There's a small gap on the back of the key - you can gently pry it open with a small screwdriver or a stiff card, but don't use too much force to avoid scratching the casing. Inside, you'll find a small round battery, usually a CR2032, which costs just a few dollars at supermarkets or online. When removing the old battery, pay attention to the positive/negative orientation (usually positive side up). Then insert the new battery in the same orientation, snap the cover back on, and press firmly. The whole process takes just 2-3 minutes, and now my remote functions are working normally again. Mercedes key batteries typically last 1-2 years depending on usage frequency. If you frequently lock/unlock without response, it's probably a battery issue. DIY replacement saves you about $100 compared to dealership service. Avoid storing the key in hot places like sun-exposed car interiors to extend battery life. After replacement, remember to test door unlocking functionality to ensure proper operation for peace of mind while driving. It's a practical little skill - give it a try, it's not difficult at all.
