Ozito Compatible USB Charger Module Pot - Compatible with Ozito/Einhell PXC

Fits many of the popular modules, the one in my example is the $2 one from AliExpress that charges your phone from the PXC battery, however there are other modules like the "MT3608 USB-C" module that can be used to charge the battery itself from your wall wart, the only change is the polarity of the diode(s).

Components

• USB-C module, they are cheap and come in various shapes and sizes from sites like AliExpress
• Cheap diodes to protect against reverse current
• Two spade type terminals
• Some kind of glue, eg hot glue, epoxy, etc

Cost: Expected total cost is roughly $3 if you use cheap components.