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.

[MalachiDella]

I recommend starting by identifying the key type. If it's a smart key for the newer Mercedes E550, it typically uses a CR2032 coin cell battery. Find a flat surface and locate the small seam on the side of the key. Gently pry open the casing using a flathead screwdriver or thin plastic pry tool – avoid using excessive force to prevent scratching the plastic. Once opened, you'll see the battery compartment. The old battery can be popped out directly; note the markings indicating positive side up. Then purchase a new CR2032 battery and insert it into the slot with correct polarity alignment. Finally, close the cover by pressing firmly but gently, and test the remote functions with a few button presses. I replaced mine last year – the whole process took under 10 minutes, and the battery only cost a few dollars, saving the dealership service fee. If your key becomes unresponsive, replace the battery promptly to avoid parking issues.

[VanEthan]

Hey, I had a smooth experience changing my key fob battery last time. There's a hidden seam on the key - just use a coin or small knife to gently pry it open. Inside you'll find a small round CR2032 battery, which is super cheap at supermarkets. When removing it, note the positive/negative sides, and make sure the printed side faces up when inserting the new one. Just snap the cover back in place and press it flat, then test if the locking function works properly. After changing it, I felt the key responded much faster. If you use your car frequently, the battery might die within a year. Doing it yourself saves both time and money, but if you can't pry it open, don't force it - just seek professional help.

[MaximusFitz]

Simply sharing my experience: The key shell can be pried open, just replace it with a new battery of the same model. I used a small tool to open it in a few moves, replaced the CR2032 battery, and the remote worked normally again. Be careful not to break the clips, it's both convenient and safe.

[DiKai]

I think it's more cost-effective to do it myself. The battery can be bought at a hardware store for just a few dollars. Be gentle when prying open the key cover to avoid damaging the appearance. After replacement, the function is quickly restored, saving on repair costs.