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Mercedes benz car key battery.
Opening your mercedes benz key and changing the battery differs slightly with the chrome key.
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Then you should see a small gap in the fob where the key was.
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Pull until the key releases.
After a few years your mercedes keys may not work even after you change the batteries.
Most mercedes dealerships will sell new keys to customers even if they did not initially purchase their car from the dealership.
If the batteries in your mercedes benz smartkey are depleted you cannot use the smartkey to get in the car or start it.
Replace your mercedes key every 2 3 years or when your key no longer works even with new batteries.
You can remove the mechanical key hidden in the widest end of the smartkey and use that but changing the batteries is a simple process that anyone can do.