On the robot I wanted to power the ESP32 from a Lipo different to the 1000mAh 25C 3S Lipo used to power the motors. So I tried a 3.8V loaded Lipo with male micro connector I soldered for Raspberry PIs with this 0.36$ USB-5-P-Port-Male-Plug-Socket-Connector:
https://www.aliexpress.com/wholesale?SearchText=Right+Angle+Micro+USB+5+P+Port+Male+Plug
While even 3.4V from Lipo are enough to power a Pi Zero, 3.8V did not make Lolin ESP32 module boot.
So I remembered that I have a Polulu 5V step-up converter
and decided to create a female/male micro USB plugin between ESP32 module and Lipo micro USB connector I already had. And it works, from the 5.09V generated by step up converter when not connected to ESP32 module I can measure 4.77V between GND and 5V pins of ESP32 module when connected as in this photo:
P.S:
Lolin ESP32 module found new home as wireless motor control for testing new steering omni wheel robot:
