I have my 2001 S430 stored a few miles from my house. Went to start it last week and the key fob would not open the door lock. I don't remember if the metal key will open the doors or just the trunk? I was thinking of using a trickle charger that plugs into the cigarette lighter and see if it will come to life after a few days? Can I gain access through the doors with the metal key? Thanks, Joe

The metal key will open the trunk, and the drivers door. If you use a charger thru the lighter you do need the ignition ON. I would get a small one with clips, some of the marine stores have a charger that can have leads hooked to the battery a plug to seperate the leads attached to the battery, in addition to the clips. The MB version is almost identical.