How to Replace the Battery in a Mercedes-Benz CLA Key?
2 Answers
Mercedes-Benz CLA key battery replacement method is as follows: There is a button on the back of the key. Press this button and push the back cover of the key forward to open it. The battery is located in the adjacent slot. During the replacement process, be sure to note the battery model. Most Mercedes-Benz key batteries are of the 3V-CR2025 type. After opening the slot, remove the old battery and replace it with a new one. Additional Information: The lifespan of a Mercedes-Benz key battery is generally two years, while the original factory battery can last up to six years. When the key battery is running low, the Mercedes-Benz vehicle will provide two types of alerts. The first is when you press the ignition switch, the dashboard will display a message to replace the key battery. The second is when you press the lock or unlock button on the key. If the indicator light on the key becomes dim or does not light up, it is time to replace the key battery.
Replacing the battery in a Mercedes-Benz CLA key is quite simple; I just helped a friend do it. The back of the key usually has a small sliding cover or button, which can be gently pried open with a coin or plastic tool. Remove the old small round battery inside, typically a CR2032 model, which can be bought at supermarkets or convenience stores. When inserting the new battery, pay attention to the orientation—the side with text should face up or match the direction of the old battery, then press it in firmly. After closing the key cover, press the buttons a few times to test. If it still doesn't work, it might be a signal issue—either the battery isn't the problem or the key is faulty. The whole process takes less than two minutes, and doing it yourself can save hundreds of dollars compared to going to a dealership, while also getting familiar with your car's accessories.
