Lithophane base 18650 battery

Simple cylindrical lithophane base with compartments for a 18650 batter, usb C chargerboard and a on/off switch.
 

I glue the additional ring into the base to have a guide for the lithophane itself.
The inner diameter is 80mm and outer 84mm.

I use a 5V ledstrip and put it on top of the 18650, never had any heat issues or something, be aware to keep all connections isolated from the battery ofcourse.