Seven Pro Tips for ESP8266 : 9 Steps (with Pictures) - Instructables
Power ESP32/ESP8266 with Solar Panels and Battery | Random Nerd Tutorials
Design your own ESP Board for Battery Powered IoT Applications
IoT based Battery Monitoring System using NodeMCU and ThingSpeak
ESP8266 Thing Hookup Guide - SparkFun Learn
Battery powered esp e-paper/e-ink display by Sev | Download free STL model | Printables.com
Tom Horton | DiY IoT | Building a Battery-operated ESP8266 Sensor Module
ESP8266: Monitoring Power Consumption • ThingPulse
One ESP8266, One Battery, One Year… And Counting. | Hackaday
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
Tom Horton | DiY IoT | Building a Battery-operated ESP8266 Sensor Module
Power Supply for NodeMCU with Battery Charger & Booster
ESP8266 Voltage Regulator For LiPo and Li-ion Batteries | Random Nerd Tutorials
ESP8266 Wireless Dev System - Non-Battery Version from BurgessWorld Custom Electronics on Tindie
ESP8266 Development Board Battery Powered and Solar Powered - Hackster.io
boost - NodeMCU power via battery + battery charger + booster - Electrical Engineering Stack Exchange
Battery voltage monitor with NodeMCU Esp8266-12E WiFi module
Battery Powered ESP8266 IoT - Temperature Sensor - Home Circuits