Here you have the worst power bank to take on a plane. It’s designed to look like a pipe bomb but don’t worry, it will only charge your phone (if you wire it in the right way). I designed it just for fun but please don’t make any stupid pranks with it and avoid to show it in public places, it can be dangerous. I’m not responsible for any consequence due to a wrong use.
(there is no switch you will have to connect the jst connectors to turn it on.
for twist the wire as in my prototype, just use a drill. insert the wires and make them turn until they keep the shape.
step up module