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Hi, my name is***** sounds like a fault with the car battery, not with the key battery. I would see about getting the car jump started for this problem.
Let me know how you make out.
Please let me know how you make out.
Does everything else in the car work? Windows, radio, horn?
If the car battery is good I would have to suspect a fault with the electronic ignition switch. There is not much you can do yourself for this problem. At this point you need to get the car connected to a Mercedes tester to check the ignition switch and other modules in the vehicle for faults.
You're quite welcome. One last thing you could try is a second key if you have one.
Please let me know how it turns out.