The file 'Battery Case For Back Of Skyrim Dragon Skull 3D Printer Model' is (stl) file type, size is 97.1KB.
Augmenting the excellent work by 3d_JOSH www.thingiverse.com/thing:2543584 and dmaccallum www.thingiverse.com/thing:1386439
Deep inside a small spring is held in place by a long tinned end of the +ve lead. Two AG13 batteries then sit +ve down. A small torus of paper helps insulation and the -ve lead holds it all together.
It could be used on anything requiring a little power or light.
Hot glue to the back of the skull tucks it away nicely.
battPilBox.stl | 326.5KB |