This is the first time I forgot the light inside the car and let it sit for 4 days before realizing that the Q7 was totally drained the battery. All the warning lights were on, the door locks didn’t work, I had to use the key to open the door and the hood. It’s been 15 years with the original battery. It’s an amazing SUV. Just charged it for an hour and it started right up, 2 hrs and it’s 90%. The battery is working quite well after that..