Your new RC has suffered a flat battery after only a week parked? Surely this must be because of an unusual drain somewhere? The 12v battery only monitors the entry system and powers up the computers for the hybrid traction battery to take over all the running functions.
Are you going to get this looked into? I was hoping, ney, expecting my RC to happily stand for many days without issue. unlike my CLS55 which barely survived 3 days... (and why I also have an MXS5, very good kit)