A battery fed MQTT weatherstation – Arduino, ESP8266, ESP32 & Raspberry Pi stuff
Battery Powered ESP8266 WiFi Temperature and Humidity Logger
ESP8266: Monitoring Power Consumption • ThingPulse
Seven Pro Tips for ESP8266 : 9 Steps (with Pictures) - Instructables
ESP8266 Voltage Regulator For LiPo and Li-ion Batteries | Random Nerd Tutorials
Adventures in deep sleep with ESP8266 and a temperature sensor – Tomas McGuinness
Design your own ESP Board for Battery Powered & Low Power IoT Applications - YouTube
ESP8266 Development Board Battery and Solar Powered with OLED display Sensor integrated, LDO voltage regualtor and Battery Monitoring System - Share Project - PCBWay
Battery powered #esp8266 logging its battery voltage : r/esp8266