How to Replace the Battery in a New Mercedes-Benz R280 Key?
3 Answers
To replace the battery in a new Mercedes-Benz R280 key, follow these steps: There is a button on the back of the key. Press and hold this button while sliding the back cover forward to open the key. The battery is located in a slot nearby. During the replacement process, pay close attention to the battery model. After opening the slot, remove the old battery and insert the new one. The Mercedes-Benz R280 is a mid-to-large-sized car under the Mercedes-Benz brand. Its front-end design is identical to the imported version, featuring sharp lines for the split-type high and low beam headlights, creating a youthful and dynamic overall appearance. In terms of body dimensions, it measures 5174mm in length, 1923mm in width, and 1664mm in height, with a wheelbase of 3216mm, making it a hatchback model.
A few days ago, I just replaced the battery in my Mercedes-Benz R280 key, and the process was quite simple, saving me some money. The key usually has a plastic casing with small gaps or tiny screws on the back. Use a small flathead screwdriver to gently pry it open—don’t apply too much force, or the key might crack. When removing the old CR2032 battery, note the positive and negative positions; there’s usually a '+' sign marking the positive side—don’t install it backward. Replace it with a new CR2032, which you can easily find at hardware stores or online (Panasonic brand is affordable). Press the cover back firmly. After replacement, test the remote unlocking function and try starting the car. If it still doesn’t work, check if the contacts are dirty—clean them with a cotton swab dipped in alcohol. The whole process takes just a few minutes, much quicker than visiting the dealership. Learning this trick and occasionally helping friends with it feels quite rewarding.
When replacing the key battery, I must remind you to be careful—damaging it would be troublesome. First, confirm that the battery model is CR2032. Locate the seam on the back or side, and use a plastic tool or your fingernail to pry open the cover. Avoid using metal to prevent scratching the casing. Remove the old battery, note its orientation, and install the new one in the same direction. After securely closing the cover, immediately test the vehicle's response. Storing batteries in hot or humid places shortens their lifespan, so avoid leaving them exposed on the windshield. If the key doesn’t work after replacement, the internal circuit might have poor contact—try gently tapping the key. If it still doesn’t work, take it to a repair shop. Typically, the battery lasts 1 to 2 years, so keep a few spares handy to avoid sudden failures. I’ve tried it a few times myself and gradually figured out the tricks.
