Caught up in the excitement for Civil War, the Hacksmith set out to create a replica shield that can actually attach and detach to his arm, much in the way Captain America's does in the film. That, of course, calls for the construction of an electromagnetic arm brace.
Because, of course.
The lithium-polymer batteries generate 3,000 pounds of lifting force -- making them powerful enough to pick up steel frames, or hurl an aluminum shield. (Note that he didn't create the actual shield, MachinaProps did).
We're given a little taste of what the shield and electromagnets can do -- he bounces it off the walls, Captain America-style! -- but we won't be able to see the full-blown action until the next video.