How to Replace the Key Battery for the New Mercedes-Benz SLK320?
3 Answers
Method for replacing the key battery of the new Mercedes-Benz SLK320: From the rear end of the key, push the marked switch upwards, and the hidden mechanical key will pop out slightly; then you can remove the mechanical key. Use the just-removed mechanical key to press against the marked position, apply gentle force, and the key shell can be opened. After removing the key shell, you can see that the battery is positioned quite deep. Simply insert any tool into the gaps on both sides and gently pry to remove the old battery. The dimensions of this car are 4011 mm in length, 1715 mm in width, and 1280 mm in height, with a wheelbase of 2400 mm. The new generation Mercedes-Benz SLK is equipped with 2.0T and 3.0T engines. In addition to conventional power options, the plug-in hybrid model will also be one of the highlights of the new generation Mercedes-Benz SLK.
Last year, I replaced the key battery for my Mercedes SLK320 myself, and the process was simple and quick. First, you'll need a small flathead screwdriver or a coin. There's usually a groove on the side of the key—gently pry open the casing to access the interior. Inside, there's a coin cell battery, typically a CR2025, which you can buy for a few dollars at a supermarket or online. When carefully removing the old battery, observe the positive terminal marking—usually, the side with the '+' symbol faces upward. Insert the new battery in the same orientation, avoiding excessive force to prevent damaging the circuit. Then, close the casing and press firmly until you hear a click to secure it. Finally, test the remote function by standing near the car and pressing the unlock button. If it doesn’t respond, the battery might be inserted backward or faulty. Replace the battery every two years or so, as weakened battery power reduces the remote range—replace it early to avoid failure at critical moments. The whole process takes less than 10 minutes, saves money and hassle, and prevents key damage.
For car enthusiasts, replacing the battery in a Mercedes SLK key is not difficult. Prepare a small screwdriver, locate the clips on the key casing, and gently pry it open to reveal the battery compartment. Remember, the battery model is CR2025—don’t buy the wrong one to avoid installation issues. Remove the old battery, noting the positive terminal orientation, and place the new battery in the same position. Avoid touching the metal contacts during installation to prevent short circuits. Close the cover and test the remote—if it works, you’re good to go. It’s recommended to check the battery life annually to minimize malfunctions. Batteries are inexpensive, so DIY replacement saves on repair shop costs. Just handle the process gently.
