How to Replace the Battery in a Mercedes ML400-CDI Key?
2 Answers
The method to replace the battery in a Mercedes ML400-CDI key is as follows: Eject the key, and you will see an English inscription in the slot where the key is ejected. There is a latch on the left side of the inscription. Press it down with a pen tip, and the head of the key can be pulled out. After separating the remote part from the key, you will see a notch. Then, use a flat-head screwdriver to pry open the remote part at the notch to replace the battery. The Mercedes E300 is a mid-to-large-sized car produced by Mercedes-Benz. The front-end design is identical to the imported version, with split high and low beam lights featuring sharp lines, giving an overall youthful and dynamic appearance. In terms of body dimensions, it measures 5078mm in length, 1860mm in width, and 1484mm in height, with a wheelbase of 3079mm. It is a four-door, five-seater sedan.
I've been driving a Mercedes ML400-CDI for several years, and changing the key battery is quite simple—no need to visit the dealership. The key usually has a flip-open design with a button or small groove on the side; a gentle press opens it. The battery is a CR2032 coin cell, available at supermarkets. First, use a small tool like a screwdriver or your fingernail to pry open the key cover—don’t apply too much force to avoid damaging the plastic. Inside, you’ll see the old battery; note the positive and negative positions before removing it. Replace it with a new battery, ensuring the positive side faces up, then snap the cover back on. Test if it locks the car. Avoid doing this in humid areas, and wearing anti-static gloves is better. Finally, check the battery life about once a year and avoid dropping the key to prolong battery life. This takes just a minute—saving time, money, and hassle.
