ESP8266 Voltage Regulator For LiPo and Li-ion Batteries | Random Nerd Tutorials
I recently finished the prototype for a battery powered ESP8266 based temperature and humidity sensor with eInk display. Currently working on a custom PCB. : r/arduino
Power Supply for NodeMCU with Battery Charger & Booster
Just my battery operated ESP8266 enviro sensor node with OTA update - Projects made with Blynk - Blynk Community
Design your own ESP Board for Battery Powered IoT Applications
Battery Powered ESP8266 WiFi Temperature and Humidity Logger
ESP8266: Long Term Data Logger Test with Batteries - Squix - TechBlog