How to Open a Mercedes Key to Replace the Battery?
4 Answers
To open a Mercedes key and replace the battery, follow these steps: 1. Flip to the back of the key and push the button to pull out the mechanical key; 2. Use a flathead screwdriver to pry open the gap at the back of the key, and the outer shell will open; 3. Remove the old battery and replace it with a new one; 4. After confirming the battery is properly installed, close the outer shell and reinsert the mechanical key. Mercedes models include: Mercedes GLS, Mercedes GLE, Mercedes GLC, Mercedes GLA, Mercedes CLA, etc. Taking the 2021 Mercedes GLS as an example, it is a mid-to-large-sized car with dimensions of length 5214mm, width 1956mm, height 1823mm, and a wheelbase of 3135mm.
I remember changing the battery in my Mercedes key fob multiple times. First, find a tool like a small screwdriver or a one-yuan coin. There's usually a seam on the back or side of the key—insert the tool there and gently pry open the back cover. Be careful not to use too much force, as the plastic casing can easily crack or get damaged. Once the back cover is off, you'll see a round CR2032 battery inside, which you can buy at supermarkets or online. Carefully remove the old battery, and when inserting the new one, make sure the positive side faces up. Reattach the back cover, align it properly, and press firmly until you hear a 'click' to secure it. After replacing the battery, test the key's functions—locking, unlocking, and trunk release—to ensure everything works. The process is simple; if you don't have tools, you can try using your nails, but wearing gloves is safer. It's recommended to check the battery every two to three years to avoid sudden power loss. This task isn't difficult, and taking your time can save you the extra cost of visiting a dealership.
I've changed the battery in my Mercedes key a few times, and it feels pretty easy. The first time, I was a bit afraid of damaging the key since it looks delicate and expensive. Just find a small gap and use a house key or coin to gently pry open the cover along the edge. Be gentle and don't force it. The battery inside is a CR2032 model—make sure to get a good quality one. When inserting the new battery, remember to place it with the positive side facing up, or it won't work. Press the back cover firmly after closing it, then test the buttons to make sure they function properly. The whole process takes less than five minutes, saving you the hassle of waiting in line at the dealership. Now, I make it a habit to change the battery regularly to avoid any inconvenience when I'm out. If you're a beginner and not familiar with the process, just follow a tutorial video and keep your hands steady—it's really that simple.
I'm familiar with replacing Mercedes key batteries. There's a seam on the back of the key, just pry open the cover with a coin. Replace the CR2032 battery inside, then snap the cover back on and test it. Don't use excessive force to avoid damage. Just look for CR2032 model when buying batteries. The process is simple and takes only 2-3 minutes. It'll become smoother with more practice. Be careful not to install the battery backwards.
