This tutorial will show you how to make a flat battery holder that holds two batteries connected in series. Because the batteries are connected in series, they make a higher voltage power supply, so you can have more LEDs in series! To learn more about series circuits, visit this tutorial on series versus parallel circuits.
1. Fold one piece of paper to snugly fit two batteries side by side.
5. Lay down the rest of your circuit. Keep in mind that the bottom two circles are negative and positive, left and right in the image below, so you can build your circuit as if these are the two circles of a single battery holder.
tip: Instead of using a binder clip, you can add neodymium magnets on either side of both batteries to keep them in place without the added bulk of the clip.
7. Decorate your circuit!