I have a recently bought laptop, and am looking for a in car power dc to ac power adapter that you don't have to connect to the battery directly. This is the laptop: http://www.bestbuy.com/site/olspag [...] 8094582785 . The power adapter has an output of 120 watts, but is the power consuption greater under full load, i.e. team fortress 2. If so, then what would be a approximation for the power used. Also if you could can you pleasetell me the aproximate power used at min. screen brightness and at full screen brightness?