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How to Replace the Battery in a Mercedes-Benz B200 Station Wagon Key?

2 Answers

AlexanderLynn

07/29/25 12:59am

Mercedes-Benz B200 Station Wagon key battery replacement procedure: There is a button on the back of the key. Press this button and slide the rear cover forward to open it. The battery is located in the adjacent slot. During the replacement process, it is crucial to pay attention to the battery model. Most Mercedes-Benz key batteries use the 3V CR2025 type. After opening the slot, remove the old battery and replace it with a new one. In terms of powertrain, the Mercedes-Benz B200 is equipped with a 2.0-liter inline four-cylinder engine paired with a CVT transmission, delivering smooth power output with a maximum power of 100kW and maximum torque of 185Nm.

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VonDaisy

08/12/25 5:10am

I've been driving a Mercedes-Benz B200 station wagon for several years and have changed the key battery several times myself. It's a pretty simple job. There's a small slit on the back of the key, just use a coin or your fingernail to pry open the cover. Inside, it uses a CR2032 coin battery. Remember to place the flat side facing the contacts, don't install it backwards, otherwise the functions won't work. The first time I did it, I installed it backwards and the key didn't respond, wasting a new battery. I recommend buying original batteries, they're stable in quality and worry-free. You can find them at small shops or on Taobao for just a few bucks. The battery usually lasts about two years, but if you frequently press the buttons from a distance or use the vehicle's sensor unlocking, it'll drain faster. After replacing, close the cover and test by pressing the buttons to see if the light comes on. If you're too rough when opening the cover, the plastic shell might crack, so handle it gently. Another suggestion: keep an extra battery in your bag for emergencies. The Mercedes key is designed quite user-friendly; changing it yourself saves the hassle of going to the dealership and you can pick up some handy tips. For daily maintenance, keep it waterproof and avoid drops, and the key won't break so easily.

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