9V Battery Hanger with Switch

I love this tree topper this designer made (https://www.thingiverse.com/thing:2629954) and I printed one out last year at the last minute for my tree. I wasn't satisfied with the awesome design, I wanted this Deathstar of Christmas to be FULLY OPERATIONAL. So I rigged up a circuit with a 9V and switch with a LED and drilled it out so I could make it look like it's about to fire. I just hung the battery in the tree with the switch hanging loose too because I made it at like 3am and didn't have