- If you want to use more than one LED, make sure to use the parallel configuration. We recommend using no more than two LEDs for this configuration because the battery is not powerful enough to light the parallel circuit with more than two LEDs. Make sure that all the positive side (longer lead on a regular LED) are in the same orientation. In our parallel circuit example, the positive sides are pointed to the top.
- We don't recommend using the series configuration because the battery is not powerful enough to light the series circuit with two LEDs.
Note: In this step we used regular LEDs (they have the two wires!), and sewable LEDs (looks like an oval!). Any kind of LEDs work - just be sure the LED, as well as the battery have good contact with the foil and that there is no tape in between the parts and the foil.