Has anyone had an issue with the battery discharging itself after sitting in the garage unstarted for 3 to 5 days. We have a 2007 Cadillac SRX that doesn't appear to have a short anywhere, but if it sits in the garage for 3 to 5 days without being started it has a dead battery. Is this a problem with this vehicle. The battery has been replaced and this still happens. Any thoughts would be greatly appreciated.