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.
Mercedes benz car key battery.
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Replace your mercedes key every 2 3 years or when your key no longer works even with new batteries.
Then you should see a small gap in the fob where the key was.
Pull until the key releases.
Most newer mercedes benz vehicles come with a smartkey.
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If the batteries in your mercedes benz smartkey are depleted you cannot use the smartkey to get in the car or start it.
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After a few years your mercedes keys may not work even after you change the batteries.
Pull on the bottom tab of the key away from the rest of the fob.