Is it possible that a LO-JAK system has been installed in a hidden location that might be draining the battery? I only ask because something is draining my roadster battery and I am aware that it has a lo-jak system on it, but I am unable to locate it and lo-jack will not tell me where on the car they installed it for the previous owner. I rarely drive it and keep it parked in the garage with the battery disconnected. Just a thought...good luck!