How to Open a Mercedes Remote Key to Replace the Battery?
2 Answers
Mercedes remote keys do not need to be disassembled to replace the battery. There is a button on the back of the key. Press this button and slide the back cover forward to open the key. The battery is located in a slot nearby and can be easily replaced. Before replacing, it is recommended to check the battery model required for your car key.
I'm quite familiar with replacing the battery in a Mercedes key. Many car enthusiasts ask me about it, and it's actually a simple task. Use a small flathead screwdriver or a plastic pry tool, start from the small notch or button on the edge of the key, press gently, and the cover will loosen. Pry it open slowly without using too much force, otherwise the plastic clips may break. Inside is a coin cell battery, most commonly CR2032 or CR2025 models—make sure to check before buying a new one. Remember the old battery's positive side faces up, and keep the same orientation when replacing. Press the cover back firmly until you hear a 'click' sound, indicating it's secured. After completion, test the lock function to ensure it works properly. Avoid using sharp metal tools to prevent scratching the circuit board. If the key doesn't respond, you may need to re-pair it with the car: just stand near the car and hold the unlock button for a few seconds. Be cautious of static electricity during the process—wearing gloves is safer. Different Mercedes key designs vary slightly by model, so online videos can be helpful for reference. Don’t overlook this maintenance task—batteries degrade after about two years, so replacing them early saves trouble.
