Tom Horton | DiY IoT | Building a Battery-operated ESP8266 Sensor Module
ESP8266 Thing Hookup Guide - learn.sparkfun.com
IoT based Battery Monitoring System using NodeMCU and ThingSpeak
Battery voltage monitor with NodeMCU Esp8266-12E WiFi module
NodeMCU power via battery + battery charger + booster - Electrical Engineering Stack Exchange
Can i power this 'nodemcu esp8266 v3' using 7.4v or 8v power source in its microusb. actually i have two li-ion battery(3.7v) so , i am going to connect this battery in
IoT based Battery Monitoring System using NodeMCU and ThingSpeak
Lolin NodeMCU ESP8266 with BME280 and Li-ion battery and his regulator... (RGB led just for status indicator) : r/esp8266
nodeMCU with Solar Power | dsin
NodeMCU battery voltage status - Need Help With My Project - Blynk Community
Avocado Watering Monitor with Telegram BOT - Hackster.io