Whether a skeleton dial watch needs to be wound up depends on the type of movement, so if you’d like a watch that doesn’t need to be wound, an automatic style is the ideal choice.  An automatic skeleton watch does all the work for you, winding itself up through the motion of your wrist. It also has no battery, meaning that it will never run flat. Power in an automatic skeleton watch is otherwise stored in the mainspring, with a metal weight called a rotor spinning every time energy is transferred.