How to Replace the Battery in a Mercedes-Benz Car Key?
2 Answers
When the battery in a Mercedes-Benz car key needs to be replaced, the detailed steps for replacement are as follows: 1. From the rear end of the car key, push up the marked switch, and the hidden mechanical key will pop out. Remove the mechanical key and open the key casing: After opening the key casing, the battery position can be seen. Slide into the gaps on both sides, gently pry to remove the old battery. After inserting the new battery, first insert the top of the casing, then press firmly on the other end to complete the battery replacement. Also, remember to reinsert the mechanical key. 2. Before replacing the battery, first identify the battery model for the car key: The battery model is specified in the vehicle's user manual. Choose a new key battery according to the specified model.
Last time my Mercedes key ran out of battery, I changed it myself and it went pretty smoothly. Look for a small notch on the side or back of the key, then gently pry it open with a paperclip or small knife. Inside, you'll see a small round battery in a slot, usually a CR2032 coin-type. When removing the old battery, don't use excessive force and be careful not to scratch the internal wiring. Insert the new battery with the positive side up, meaning the shiny side faces outward. Close the key shell and press it slowly until you hear a click. Finally, press the unlock button to test if it works—if it does, it should last a long time. If you don't have the right tools, you can buy a dedicated prying tool for just a few bucks, or follow online Mercedes key tutorial videos step by step. Avoid forcing it open—I once cracked the shell and had to spend time fixing it.
