How to Replace the Battery in a Mercedes-Benz S280 4MATIC Key?

2 Answers
StGiselle
07/29/25 7:34pm
Method for replacing the battery in a Mercedes-Benz S280 4MATIC key: Press the button on the back of the key to pull out the mechanical key; Insert the mechanical key into the slot and apply slight pressure to pop open the key cover; Remove the old battery and replace it with a new one; Close the cover to complete the battery replacement. The lifespan of a Mercedes key battery is generally two years, while the original factory battery can last up to six years. When the key battery is low, the Mercedes-Benz vehicle will alert the owner in two ways: Pressing the ignition switch will display a message on the Mercedes dashboard to replace the key battery; When pressing the lock or unlock button on the key, if the indicator light on the key dims or does not light up, it is time to replace the key battery.
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IsabellaDella
08/14/25 2:37pm
I've got experience replacing the battery for a Mercedes-Benz S280 4MATIC key. As someone who enjoys DIY car maintenance, the steps are actually quite simple: First, locate the rear cover notch on the side of the key, then gently pry open the cover using a small flat-head screwdriver or plastic tool. Inside you'll find a small round battery, typically a CR2032 model. When removing the old battery, remember its polarity orientation (usually positive side up). Then insert the new battery, making sure it's fully secured. Snap the cover back on until you hear a click indicating it's locked. Finally, test the buttons to see if they can lock/unlock the doors. Key batteries usually last 1-2 years - replace them when signal weakens. DIY replacement costs just over 10 yuan, much cheaper than dealership service. After replacement, regularly check key functions to prevent sudden failures. The whole process takes just minutes, but remember to handle gently to avoid damaging the key casing.
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