Finally, a mount that displays a lithophane without needing to be plugged in. Links to the electronics are below. Any 2032 battery will do. A little soldering and you're good to go.

https://www.adafruit.com/product/1622

https://www.amazon.com/AuBreey-Arduino-LilyPad-Battery-Holder/dp/B072DWDTQ9/ref=sr_1_15?dchild=1&keywords=2032+battery+mount&qid=1600654240&sr=8-15