Problem: There is no solution.
Solution: There is no problem.
Problem science?
Alternatively...
Scenario: Table Tennis Ball Launcher is left on.
Problem: Uses up electricity.
Solution: Power using mouse wheel.
Problem: Mouse tires.
Solution: Get a mechanised mouse.
Problem: Mechanised mouse needs power.
Solution:Use a mouse wheel.
Problem: Mouse still tires...
Solution: MAGNETS! EVERYONE WINS!