Hello, I have been the proud owner of a SL350 for a good 6 weeks (EZ 05/2010). Since I use the vehicle less now, I carry myself with the idea to buy a charger or charging device for the rear battery. After I have read a lot now, I have the following specific questions: Is the Ctek MXS3.6 identical to the device that you can buy from Mercedes (item number: A0009820121) or are there any differences? Is it useful to buy this device or is there e s by Ctek what better for the rear battery of my SL350? Then a question for handling. Is it really so easy that you only have to plug the adapter of the charger into the socket under the boot lighting and the battery is charged or the charge is received? Sorry, if I asked stupid questions. But I’m technically totally undisturbed. Greeting Richy