Amazon.com: ACEIRMC ESP8266 ESP-12 ESP-12F NodeMcu Mini D1 Module Lua 4M Bytes WLAN WiFi Internet Development Board Base on ESP8266 ESP-12F for Arduino,Compatible with WeMos D1 Mini (10pcs) : Electronics
Running NodeMCU on a battery: ESP8266 low power consumption revisited – Tinkering with Technology
diymore ESP8266 ESP32 2 x18650 Lithium Battery Shield V8 5V/2.2A Mobile Power Bank Charging Module Micro USB/Type C for Arduino|Instrument Parts & Accessories| - AliExpress
Power ESP32/ESP8266 with Solar Panels and Battery | Random Nerd Tutorials
Running Wemos D1 Mini ESP8266 On Single Lithium-Ion 18650 Cell – New Screwdriver
ESP8266 Voltage Regulator For LiPo and Li-ion Batteries | Random Nerd Tutorials
Battery Powered ESP8266 IoT - Temperature Sensor - Home Circuits
Power Supply for NodeMCU with Battery Charger & Booster
One ESP8266, One Battery, One Year… And Counting. | Hackaday
ESP8266 - running on battery power | Electronza
IoT Lithium Battery Monitoring system using ESP8266 & Arduino IoT Cloud
ESP8266 Voltage Regulator For LiPo and Li-ion Batteries | Random Nerd Tutorials
Amazon.com: ACEIRMC ESP8266 ESP-12 ESP-12F NodeMcu Mini D1 Module Lua 4M Bytes WLAN WiFi Internet Development Board Base on ESP8266 ESP-12F for Arduino,Compatible with WeMos D1 Mini (10pcs) : Electronics
Running NodeMCU on a battery: ESP8266 low power consumption revisited – Tinkering with Technology
Power Management | Adafruit Feather HUZZAH ESP8266 | Adafruit Learning System
Design your own ESP Board for Battery Powered IoT Applications
Power Supply for NodeMCU with Battery Charger & Booster
Seven Pro Tips for ESP8266 : 9 Steps (with Pictures) - Instructables