I went beyond that, and ended up catching a rogue WiFi access point in the process. When I needed to extend the range of some ESP8266-based ... it used the same password as the staff gave me ...

By taking a 3D printed design intended to attach a TP4056 module to the end of an 18650 cell and combining it with an ESP8266 firmware that turns the powerful microcontroller into a WiFi repeater ...