Button Battery LED Necklace

A simple set up to hold a battery and LEDs to make light up necklaces or other crafts involving button batteries. This design requires a CR2032 button battery, two 3mm LEDs, and string to complete the necklace

Step 1: Snap in the Battery

The 3-Volt 2032 button battery securely snaps into place and built in grooves guide the LED leads into place and hold them snug against the battery.

To remove the battery, just use the edge of a table to push on the battery through the semicircular cutout on the holder.

Step 2: Insert LEDs

There are slots on the side of the battery holder that will hold the LED leads securely against the surface of the battery. When assembling, remember that LEDs only work one direction and the long wire must be connected to the positive side (shiny side) of the battery. 

Step 3: Connect the Lanyard Holder

Gently pull out on the tabs to allow the battery holder to snap into the lanyard holder.

Step 4: Thread the String

Cut a string to the appropriate length and thread through the hole on the lanyard holder piece

Step 5: Add Design with Cutout Eyes

The LEDs are spaced out so that the battery holder can be taped to the back of a piece of card stock and designed as eyes for a ghost or other character. There are several designs included at https://passionatelycurioussci.weebly.com/blog/spooky-led-necklaces that can be printed and cut out