Installed iRoad X9 in my car last year. Had set the voltage threshold to 11.8 V. Went for a vacation for 7 days. When I came back I could not unlock the car with smart key and could not start the engine. The iRoad had drained the car battery. So it looks like after it detects 11.8 V it does not disconnect the power. It still draws power from the car battery. Lesson learnt. Remove the power plug and USB cable from the camera if you are going on vacation. I don't know which workshops can install the battery pack that is discussed in some forums.