Arduino Enigma Portable
I recently got an Arduino Enigma on Tinder (https://www.tindie.com/products/ArduinoEnigma/arduino-enigma-i-m3-m4-machine-simulator-w-case/) which is a Arduino Enigma Machine Simulator with touch display. Is pretty handsome with a wooden case and perfectly functioning simulator of the Enigmas 1, M3 and M4.
But to work, it needs external power supply. Either a USB-B cable or a 9v battery with a barrel plug. And I hate having external addons to make it work.
So I put inside the case a lipo battery, a lipo charger and a 5v stepup to power up everything.