The video shows a person drawing a diagram on a whiteboard with a black marker. The diagram illustrates how batteries work, with two batteries connected by a line. The person is drawing arrows to show the flow of electricity from the batteries to an electrical device. The diagram includes a title at the top that reads "How Batteries Work," and the word "electrolyte" is written at the bottom. The person's hand is visible as they draw the diagram, and the marker is held in their right hand.