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