Hello together – my first post as new addition 🙂 I am proud new owner of a Mercedes CL 500 year 2007 in absolute original condition, so no built-up Gangsta-Mobil 😉 My “problem”: I drive the vehicle very rarely for time reasons, i.e. at most every 4-8 weeks. This leads to the fact that very often when I want to leave spontaneously the battery is empty and the vehicle does not start anymore. Only yesterday I spoke to a Daimler service specialist again He once again told me that this was quite normal with these vehicles packed with electronics and their dizzyingly high quiet current consumptions – his advice: I should nevertheless get a high-quality maintenance charger. Sounds logical – my problem is only: my vehicles are in a large underground garage system, in which no sockets or private electricity consumers are allowed. So no way to connect a commercially available maintenance charger (e.g. CTEK), not even with a mild extension line through the entire system 😉 Does someone happen to have a similar topic, and a solution for it? I don’t want to constantly expand the heavy-ton battery and charge it in the apartment while the vehicle forgets all the settings again, but think that there would have to be any solution based on any mega capacitors or with e.g. 2-4 other external batteries on a mobile transporter that can then be charged in turn. Has anyone got any advice? Thank you very much already! Best regards Robert