Basic LED Lit Badge / Keychain

A member from CCCKC approached me over a month ago wanting to make some special promotional badges for Defcon. They wanted something like these (http://inventgeek.com/Projects/Laser-Fab-LED-Necklace/overview.aspx) but wanted to keep the form factor of their previous badges (luggage tag size, basically). This is the first prototype version of the resulting LED badges.

These badges are glued together, so they don’t have any protruding fasteners, but the battery can easily be replaced (the L