NodeMCU: Supply ESP8266 with Solar Cell and Battery with Power
Relay Shield with ESP8266 ESP-01
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Add battery charger to ESP8266 and ESP32 (well done) - eMariete
Battery Life of an ESP8266 design – Arduining
Design your own ESP Board for Battery Powered & Low Power IoT Applications - YouTube
One ESP8266, One Battery, One Year… And Counting. | Hackaday
New product in PCBWay's gift shop! ESP8266 ESP-01 Serial WIFI Wireless Transceiver Module Receive LWIP AP+STA - Activities - PCBway
Very DeepSleep and energy saving on ESP8266 – Part 1: Basics – Arduino, ESP8266, ESP32 & Raspberry Pi stuff
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GitHub - tzapu/DeepSleepDHT22: Battery Powered ESP8266 WiFi Temperature and Humidity Logger