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How to keep my Mercedes charged up?

Hi,

I have a 2017 C-Class Mercedes (C 300) that I keep in Spain for when I visit. As it's one of these modern cars permanently connected to the internet, the battery only lasts 4-5 weeks. As I don't have any means to keep it charged, would it do any harm if I disconnected one of the battery cables to keep the battery charged up?

Philip