How to Replace the Battery in a Mercedes-Benz ML350-4MATIC Key?

[McElliana]

The steps to replace the battery in a Mercedes-Benz ML350-4MATIC key are: 1. Locate the button on the back of the key; 2. Press and hold the button while sliding the back cover forward to open it; 3. The battery is inside the slot, remove and replace it. Taking the 2021 Mercedes-Benz ML350-4MATIC as an example, its body dimensions are: length 5001 mm, width 1896 mm, height 1430 mm, with a wheelbase of 2939 mm and a fuel tank capacity of 66 liters. The 2021 Mercedes-Benz ML350-4MATIC is equipped with a 2.0T turbocharged engine, delivering a maximum power of 220 KW and a maximum torque of 400 NM, paired with a 9-speed automatic transmission.

[Finn]

I've been driving a Mercedes ML350 for over five years and have changed the key battery several times. It's really simple. There's usually a small gap on the back of the key. Just use a coin or a small screwdriver to gently pry it open, and the shell will come off. Inside, you'll find a round button battery, model CR2032, which you can buy at supermarkets or pharmacies. Make sure not to mix up the positive and negative directions—usually, the side with the text faces up. After replacing it, press the shell back together and test the remote locking function. If it doesn't work, check the battery installation. I think changing it every two years is a good idea to avoid any malfunctions at critical moments. The batteries are cheap and easy to get, so doing it yourself saves you the hassle of going to a shop. Plus, it's a good opportunity to clean out any dust inside to keep the key responsive.

[OPaige]

As a newbie, I was quite nervous when changing the Mercedes key battery for the first time, so I first found a video reference on YouTube. There's a narrow slit on the back of the key. If you can't pry it open with your fingernail, use a coin or small key ring to gently open it. The small battery inside is of the CR2032 type. After taking a photo to remember the orientation, buy a new battery and replace it. There are plenty of options available when searching for the model online. After reassembling the case, test the lock button to confirm it functions properly. Remember, if the key response slows down, it's time to replace the battery—don't wait until it's completely dead. Buying a battery from the store costs just a few bucks, and the whole process takes only a few minutes. Learning some basic maintenance gives a sense of accomplishment, so you won't panic when encountering similar small issues in the future.

[DaniellaFitz]

As a DIY enthusiast, changing the battery for a Mercedes key is super easy. There's a notch on one side of the key—use a screwdriver to pry open the casing without applying too much force to avoid damaging the components. Remove the old CR2032 battery, noting its orientation, then replace it with a new one, ensuring good contact. After closing it up, test the remote car lock, and you're good to go. Doing it yourself saves money and time, helps you understand the key's internal structure, prevents dust buildup from affecting the signal, and is full of fun.

[McJocelyn]

Replacing the battery for a Mercedes ML350 key is quite simple: Prepare a CR2032 coin cell battery and a small coin or tool. Pry open the shell along the seam on the back of the key, remove the old battery, and insert the new one in the same orientation. Close the cover and test the locking function to ensure it works. The entire process takes just a couple of minutes. The batteries are inexpensive and available at stores or online shops—don’t hesitate, as the steps are easy to follow.

[OHaven]

For older individuals, take your time when replacing the key battery. The Mercedes key has a small notch - carefully pry it open with a coin without using excessive force. The battery inside is a CR2032 model, so make sure not to install it backwards. After replacement, remember to test the door unlocking and locking functions to ensure they work properly. Buying batteries at nearby stores is very convenient. If unsure, spending a small amount at a 4S shop for assistance prioritizes safety. Avoid forcing it open to prevent damaging small components and affecting daily use.