How to Replace the Battery in an Older Mercedes-Benz SLC260 Key?
2 Answers
Steps to replace the battery in an older Mercedes-Benz SLC260 key are as follows: 1. Insert the mechanical key into the side slot of the key fob, press the internal gray button, and with the other hand, push the rear end of the key upward. When a gap appears, you can remove the mechanical key. 2. Then, manually remove the rear end to replace the battery. After installing the new battery, reinsert the key bracket, completing the battery replacement. Below is additional information about remote keys: 1. How remote keys work: The key emits a weak radio wave, which is received by the car's antenna. The electronic control unit (ECU) identifies the signal code, and the system's actuator (motor or electromagnetic coil) performs the locking/unlocking action. 2. If the remote key gets wet, do not shake it vigorously or press any buttons, as this can cause water to seep into other critical circuits. Also, avoid using the remote to unlock the car immediately, as it may damage the circuit board. The correct approach is to open the key casing, lay it flat, and dry it with a hair dryer before further inspection.
I've been driving my old Mercedes-Benz SLC260 for years, and only discovered the battery was dead when the key stopped working last time. Doing it myself was really simple and saved money. The specific steps are: first locate the small notch on the side of the key, then gently pry open the casing using a coin or plastic card - be careful not to use too much force to avoid scratches. Inside you'll find a CR2032 coin battery; I carefully removed the old one with a screwdriver. When inserting the new battery, make sure to align the positive/negative directions correctly (usually positive side faces outward with clear markings). Then snap the casing back together with a click. Finally, test the unlock and ignition functions to confirm it works. The whole process takes less than 5 minutes, and the battery costs just a few bucks online. I always carry a spare just in case - regular maintenance helps extend the lifespan of older car keys.
