How to Replace the Battery in a Mercedes Car Key?

2 Answers
JohnRose
07/24/25 10:58am
Method for replacing the battery in a Mercedes car key: Select a new button battery that meets the specified model, take out the mechanical key, use the mechanical key to press against the notch, and open the key casing to install the battery. Below are the detailed steps for replacing the battery in a Mercedes car key: 1. Choose a new button battery that meets the specified model; 2. Push the switch upwards from the end of the key to eject the mechanical key and remove it; 3. Use the mechanical key to press against the notch and pry outward to open the key casing, then install the battery. Below is some specific information about Mercedes: 1. Mercedes is a German luxury car brand and the inventor of the automobile; 2. The Mercedes three-pointed star emblem is one of the world's most famous car and brand logos.
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KingMarie
08/11/25 5:57am
Replacing the battery in a Mercedes car key is actually quite simple. I remember when my car key battery died, I first found a small tool like a coin or thin card to insert into the small slot on the side of the key. With a gentle pry, the casing opened up. Inside, there's a round button battery, usually the CR2025 model. Make sure not to put the battery in the wrong way, and when removing the old battery, be careful not to damage the contacts. Press the new battery in firmly, then close the casing and test the unlock function by pressing it a few times. Don't worry about breaking it—the key is designed to be quite durable. I do my own maintenance every week, and after replacing the battery, the key responds faster, saving both money and hassle. Usually, check the manual for tips. If the key light flashes, it's a low battery warning. Keep a spare battery in the car so you can solve the problem anytime.
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