How to Replace the Battery in a New Mercedes-Benz E550 Key?

[Frank]

Mercedes-Benz key battery replacement tutorial is as follows: 1. Push the small switch tooth at the tail of the remote to the right, and a manual key will pop up. 2. After pulling out the key, gently insert it into the slightly larger hole on the back of the keyhole. Insert it about one centimeter, touch the remote battery cover to the card, gently pry it, and the cover will open. 3. Open the cover by hand to see the remote battery. Tap the battery lightly and it will pop up. Replace it with a new battery, put the key cover back on, and insert the manual key back to complete the process. You need to replace the key battery under the following circumstances: 1. The remote control distance becomes shorter: Previously, you could open the car door from five or six meters away, but now you have to be very close to the door for it to respond. 2. Occasional malfunction: When opening the door, you have to press the button several times before it responds, and it may take multiple presses to successfully unlock. 3. The indicator light is dimmer: Observe the indicator light on the key. When you press the button, the light is dimmer than usual or flickers.