How to Replace the Remote Battery of an Old Mercedes-Benz?
2 Answers
Here is the method to replace the remote battery of an old Mercedes-Benz: 1. Press the small button on the back of the key and pull out the mechanical key. 2. Use the mechanical key to open the key cover. 3. Remove the button battery and replace it with a new one. 4. Finally, close the key cover. Precautions for replacing car key batteries are as follows: 1. When replacing the button battery, never hold the positive and negative terminals with your fingers. The correct way is to hold the side of the battery, as the skin and flesh of your fingers are conductive, and holding the terminals can reduce the power of the new battery. 2. The model of the new battery must be the same as the old one. 3. To prevent severe degradation of the electronic key's performance, avoid placing it within 1 meter of electrical devices that generate magnetic fields.
I've been driving my old Mercedes for over twenty years, and changing the remote key battery is a piece of cake. First, take a small screwdriver or coin and check if there's a notch on the back cover of the key—just gently pry it open. Most older models use a CR2032 coin cell battery, so make sure you don't buy the wrong type. After opening it, remove the old battery carefully without damaging the small contacts nearby. When installing the new battery, ensure the positive side faces upward, then press the cover firmly to secure it. After replacement, test the buttons to see if the light responds normally. If it doesn't light up, check for oxidation on the contacts and clean them with an eraser. Some car keys require a small screw to be loosened—choose the right tool carefully to avoid damaging the plastic casing. Older car remotes sometimes have weak signals, so after changing the battery, take a moment to clean out any dust inside the key to extend its lifespan. I always keep a spare battery in the car for emergencies. Remember, if it still doesn’t work after multiple attempts, you might need to consider circuit issues.
