Laptops usually run on a single battery. Some run on an external AC/DC. This could also charge the battery, while supplying energy to the laptop itself. Laptops are capable of doing the same tasks as a desktop PC, though at times they may be a little less powerful. They contain all the components that are present in a conventional PC in a miniaturized size
This is a Brand New DELL Original Product 90-watt AC Adapter for Dell Notebooks with 3 ft Power Cord. Dell Part Numbers: PA3-E, WK890, Y807G, 330-1826, Y808G, 330-1825, Compatible Notebook Models...