How to Replace the Battery in a Mercedes CL Key?
4 Answers
Method for replacing the battery in a Mercedes CL key: 1. Flip to the tail end of the key where there is a push button, push it upwards and the metal key inside will pop out, then pull out the key; 2. Next, observe a gap at the tail end of the key, find a tool that can pry and gently use force to open it, the outer shell of the key can then be opened; 3. After opening the shell, the key is positioned quite deep inside, you can use a thin object to slide in from the side gap, pry upwards to remove the old battery, and then replace it with a new one. The Mercedes CL is positioned as a high-performance coupe, developed as a large two-door four-seater coupe based on the luxury S-class. In terms of body dimensions, the Mercedes CL measures 5056mm in length, 1871mm in width, 1419mm in height, with a wheelbase of 2955mm.
I found that replacing the battery in a Mercedes CL key is actually quite simple and can be done at home. First, you'll need to prepare a new CR2032 battery, which can be easily purchased at supermarkets or hardware stores. There's a small groove on the key—use a small tool like a coin or nail clipper to gently pry open the casing, being careful not to apply too much force to avoid damaging the plastic. Once opened, you'll see a small battery compartment inside. Carefully remove the old battery, making sure not to touch the internal metal contacts to prevent short-circuiting. When inserting the new battery, ensure the positive side faces up—there’s usually a marking, but if unsure, refer to the manual for confirmation. Finally, reassemble the key and test it by pressing the unlock button near the car to check the lights. The whole process takes about 5 minutes, and I recommend checking it every two years or so to save the cost of sending it to a 4S shop. Car key designs are becoming more user-friendly, and this DIY process gives a great sense of accomplishment. Here are some additional tips: keep your workspace clean to avoid losing small parts, and if the key still doesn’t work after replacing the battery, it might be a signal issue—try resetting the key or testing it in a different environment. In short, go ahead and do it yourself—it’s safe and cost-effective!
As a long-term owner of a Mercedes-Benz CL, I often change the key battery myself to save costs. The steps are: find a small flat-head screwdriver, gently pry open the latch at the bottom of the key to reveal the battery compartment; remove the old battery (usually a CR2032) and wipe the dust inside the slot with a dry cloth; insert the new battery ensuring the electrodes are aligned; snap the cover back on and press firmly with your fingers to test the remote function. If the buttons don't respond, it might be an installation error—just recheck. The whole process takes less than 10 minutes. I recommend choosing a good brand like Energizer for longer battery life. Remember to work in a dry, well-lit area, avoiding kitchens or bathrooms to prevent short circuits. Also, the car will emit a faint warning signal before the battery dies, so staying alert can prevent travel hassles. DIY not only saves you a hundred or so in repair fees but also builds life skills—why not give it a try?
Here's my experience with replacing the battery in a Mercedes CL key: The key casing has a hidden opening, gently pry it open with your thumb or use a tool; remove the old battery and replace it with a new CR2032; close the cover and test the signal. Be careful not to use excessive force when opening it, as it can damage the internal components. Buying batteries online is recommended for cost-effectiveness and convenience. If done correctly, the process takes just a few minutes without needing professional help. Keeping the key clean extends its lifespan.
