Questions about DDC55

I bought the DDC55 mainly to clean the glass roof. It works, but it's a bit disorientated upside down, i.e. it doesn't clean in a controlled manner like it does on a vertical surface and it never reports that it's finished.
But if it cleans for long enough, it gets everywhere. For me it's ok, much easier than cleaning by hand.

unfortunately I don't know.

No, you can't use it without a cable. The battery mentioned in the description only serves to give the owner a few seconds to take the part off the window in the event of a power failure before it falls and falls and collides with other objects or subjects. I find it incomprehensible that Galaxus does not describe it this way.

That's easily enough. You can clean many 10m2 windows with one battery charge.

Glass cleaner, but if you change the mops often the traces are minimal