Bit of an SOS from me this eve...I've had a warning from the car regarding the battery (picture below), saying its using too mush power when stationary. Took the car for a 40 min drive with stop-start and air conditioning off etc. When I got home and turned it off it said the battery was very low and I should take the car for a drive. Repeated the process but I've just got the same warning.
I had exactly the same message last Monday from my quaint old-fashioned R59 Roadster, after I hadn't used it for several days. As luck would have it, I had a longish drive to do that day; the message went away and hasn't reappeared since.