Is the fob key the emergency key or the manual key? sorry Im new at this and its my first MB. If it's the manual key in the electronic key then I have tried it and it doesn't work. At times I even feel like if I turn it too hard it will break. Ill try it again and by doing this and lets say it works, will it set off the alarm? Can I take the keys to the dealer tomm and have the battery checked or just have it towed? Not sure what to do. Thanks for your help and input.