Amazon.com: DIYmall ESP8266 ESP-01S WiFi Serial Transceiver Module with 4MB Flash : Electronics
GitHub - frolswe/esp-battery-logger: Simple project for the esp8266 using the power saving features of the chip to test the possibility of battery powered sensors.
Design your own ESP Board for Battery Powered IoT Applications
ESP8266-Based WiFi Repeater Runs for Three Days on a Single Charge - Hackster.io
New product in PCBWay's gift shop! ESP8266 ESP-01 Serial WIFI Wireless Transceiver Module Receive LWIP AP+STA - Activities - PCBway
A battery fed MQTT weatherstation – Arduino, ESP8266, ESP32 & Raspberry Pi stuff
I have just made a prototype of ESP8266 (ESP-01) IoT temperature & humidity SI7021 sensor and also 2x three pin soil moisture s… | Iot, Arduino, Humidity sensor
ESP-01: Works when plugged into programmer but not when simply powered up - IDE 1.x - Arduino Forum