What are the steps to replace the battery in a Mercedes-Benz key?

[VonCorey]

The steps to replace the battery in a Mercedes-Benz key are: 1. Remove the mechanical key; 2. Insert a tool into the slightly larger hole at the back of the key slot and gently pry it open; 3. Press lightly on the battery to remove and replace it, then reassemble the key in reverse order. Taking the Mercedes-Benz E-Class 2021 model as an example, its body dimensions are: length 5078mm, width 1860mm, height 1490mm, with a wheelbase of 3079mm. The Mercedes-Benz E-Class 2021 is equipped with a 2.0t turbocharged engine, with a maximum power of 220kw and a maximum torque of 400nm, paired with a 9-speed automatic transmission.

[LaSienna]

As a long-time car enthusiast, I've replaced the battery in my Mercedes key several times. The process is quite simple, so I'd like to share my experience. First, prepare tools like a small flathead screwdriver or coin. Mercedes keys usually have a flip cover design - gently pry open the shell along the edges without using too much force to avoid cracks. Remove the old battery (typically a CR2032 coin cell), paying attention to the positive/negative polarity. Then insert the new battery with the positive side facing up, aligning it properly and pressing firmly. Finally, snap the cover back in place and immediately test button functions like unlocking doors or trunk to ensure proper response. The whole process takes about 10 minutes. I recommend using OEM batteries to avoid leakage damage from off-brand ones. Normally, if the key's indicator light dims or functions become delayed (usually every 1-2 years), it's time to replace the battery. Doing it yourself can save dozens of dollars compared to dealership service.

[StBethany]

I often drive to work, and it's quite troublesome when the car key runs out of battery. Replacing the battery in a Mercedes key isn't difficult. The first step is to locate the small gap on the key and gently pry it open with a fingernail or keychain. Don't pry too hard, or you might damage it. Take out the old battery (CR2032 model) and remember the positive terminal position to avoid putting it in wrong. Install the new battery with the positive side facing up and snap it into place. Then, close the casing and test the remote control distance—if it's normal, you're good to go. I find it much more convenient every time I replace it. You can find the battery at any supermarket, and it's a good idea to keep a spare in the car just in case. The battery typically lasts one to two years. After replacing it, remember to clean your hands to avoid static electricity, which can also improve daily efficiency.

[LaTanner]

During my student days, I helped a classmate replace the battery in their Mercedes key. The steps were simple: first, use a small tool to gently pry open the side of the key—don’t force it. Remove the old battery, which was a CR2032 coin type, and replace it with a new one, ensuring the positive side faces up. Align it into the slot, press the shell back together, and then test the buttons to see if the light comes on. I was a bit nervous the first time, but watching a video tutorial made it quick and easy. Just handle it gently. Buying the battery online was cheap and convenient.