It's been parked indoors for about 4 days now due to bad weather, today I went to start her up for a few minutes, but the battery is dead. It's a brand new Optima red top I bought two months ago, so something is draining the battery. I boosted it and noticed when the car is off, the OEM tape deck makes a sound every 2 seconds, it sounds like it's trying to eject a tape, but there's no tape inside, and it never stops making this sound. Could something so small cause my battery to die in 4 days, or is it draining from somewhere else?