How to Replace the Battery in a Mercedes-Benz E300 Key?

[SanPhoebe]

To replace the battery in a Mercedes-Benz E300 key, follow these steps: 1. Press the small switch on the back of the key to remove the mechanical key. 2. Before opening the key's back cover, press the release button on the back. 3. Open the battery compartment on the left side of the key to see the battery. 4. Use a small flathead screwdriver to remove the old battery. 5. Insert the new battery with the positive side facing up. 6. Reattach the key cover and the mechanical key. 7. Test the key's lock button and other functions to ensure they work properly. Taking the 2021 Mercedes-Benz E300 as an example, it belongs to the mid-to-large-sized car category, with body dimensions of 5078mm in length, 1860mm in width, and 1484mm in height, a wheelbase of 3079mm, and a trunk capacity of 486 liters.