Draining the battery.. I've had this happen twice while camping. Leaving the rear hatch open seems to drain the battery. I've turned the only door lights switch off i can. My first trip i had a tent opening attached to the hatch for 4 days. Tried to start the car after that and the battery was totally dead. I figured i had left some cords plugged into the USB ports and maybe that drained the battery. 2nd time was for a single night. Nothing plugged into the USB ports. The battery wasn't dead but there was that delay starting which I've seen before when the battery is lower than normal. I camp enough and leave the rest hatch open regularly. Not sure what i need to do to preserve the battery? (Touring).