I have many songs on a usb stick, and they play fine in the tesla. The usb stick has a light at the end of it to show when it is getting power. I have noticed that the light stays on continuously, even when the car is off. I am wondering if this means the usb is drawing power off the 12v battery, and may lead to problems. Any ideas? Has anyone left a usb stick in the car 24 X7 ? The reason I like to keep the usb plugged in is so that the next time I drive the car, the usb continues to play from where it was when I parked the car.