I had a different experience than yours. I left the lights on all day. I was on the phone when I reached my client's location and didn't notice the "lights on" warning tone when I pulled the key out. After a long day, I thought it was strange that my key fob would not unlock the car. I opened the driver's door with the key and tried to start it. At that point, I noticed that the lights were left on. So I called AAA and they hooked up the jumper cables to the battery and the car started. I note that the battery level for the electric motor was not depleted at all. I don't remember if I had to enter the security code for the car radio but I think I did as I had about a 2 hour drive home so it would have been unbearable. The battery was fully charged when I got home. Both key fobs worked as normal the next day as it is usually my wife's car. We have a 2006 HCHII.