JahVision

Helllo, Well the wife went to Lunch only to call for a Jump on the LS460 with 2100 Miles. My questions: is there a constant drain somewhere?, Can the lights be left on accidently? and if left on for 2hrs will that drain the battery, Is it possible to have a bad battery?, Can an interior light be left on? You would htink that when you leave the car with the key that lights would go off automatically. Should I take car to dealer? Thank you ALex