My S2 had a wire trapped which was causing the drain.This leads to roughly a 1-2 week flatten.
The Coupe will not last a week unless plugged in however there are a number of security things fitted to locate it.
I also see issues with some of the dashboard indicator (windscreen, interior light, boot) staying on which would not help.
Best bet is to get a local specialist electrician to go through the fuses in the brain box in the engine room.
