Ctek into 12v socket under dash. I don't even know where the battery is ;-)
As I said earlier, with the battery under the back seat it might as well be hidden. After three years of connecting via the socket I think I'll continue.
Been in touch with a very helpful woman at CTEK today and she has reassured me about the sequence of charging/conditioning and the connect-and-forget capability of my new MX 3.8. She even went as far as implying agreement with me that it does not have the appealing simplicity of the XS3600. Another example of a gadget which is over-featured.