Tutorial for Replacing the Battery in an Older Mercedes-Benz R350-4MATIC Key
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Here is the tutorial for replacing the battery in an older Mercedes-Benz R350-4MATIC key: 1. First, flip open the tab at the back of the key to remove the mechanical key. Insert the mechanical key into the side slot of the key, press the internal gray button, and with the other hand, push the back end of the key upward. When a gap opens, remove the mechanical key. 2. Then, manually remove the back end to access and replace the battery. 3. After installing the new battery, reinsert the key holder, completing the battery replacement process. Here is more information about Mercedes-Benz keys: 1. The lifespan of a Mercedes-Benz key battery is typically two years, though the original factory battery can last up to six years. 2. When the key battery is low, the Mercedes-Benz vehicle will provide a prompt. Upon pressing the ignition switch, the dashboard will display a message to replace the key battery. 3. The design of Mercedes-Benz key fobs is not dependent on the model or series. Keys from the same era, whether for C-Class, E-Class, or S-Class, are generally similar, and the method for replacing the battery is largely the same.
Last time I replaced the battery for my old Mercedes-Benz R350 key was quite smooth. The key is the folding type with remote control. The operation is simple: gently pry open the plastic shell from the small gap on the back—don’t use too much force to avoid cracking it. The old battery was a CR2032. When installing the new one, make sure the flat side faces outward and the polarity is correct, otherwise it won’t work. Reassemble it, test the unlock/lock functions, and you’re good to go—the whole process takes just a minute or two. Buying the battery at a supermarket costs just a few bucks, saving a trip to the repair shop. I’m sharing this because many people worry it’s troublesome, but it’s actually quite easy. Just remember to be gentle to avoid losing small internal parts, especially since old car key components can be hard to find. Regularly replacing the battery prevents remote failure and ensures daily convenience.
