I suspect something might be draining the battery slightly on my A208 CLK430. I've just fitted a new battery as the old one was wasn't the correct spec and was of unknown age, but the voltage is still dropping slightly after the car has been standing for a week. I read up on how to check for a parasitic battery drain, and that the electric seat module is a likely culprit to look at, but I can't find out for sure whether I need to wait for the car to go to 'sleep' before using the ammeter to check. Does anyone know for sure how long you need to wait for the car to go to 'sleep'?