ESP32 ESP8266 4x 18650 Battery USB Power Bank Shield Holder V9 3V/5V – diymore
diymore ESP8266 ESP32 ESP32S WeMos 16340 18650 Battery Charger Shield Board Micro USB Type C Output 5V/2A for Arduino Power Bank|Integrated Circuits| - AliExpress
Battery-Powered ESP8266 Sensor? Never Been Simpler | Hackaday
Esp8266 Esp32 Power Supply Rechargeable Dual 16340 Lithium Battery Charger Shield Module Board Power Bank - Buy 16340 Lithium Battery,Power Bank Power Bank,Esp32 Battery Product on Alibaba.com
ESP8266 Development Board Battery Powered and Solar Powered - Hackster.io
IoT based Battery Monitoring System using NodeMCU and ThingSpeak
Esp8266 Esp32 Power Supply Rechargeable Dual 16340 Lithium Battery Charger Shield Module For Arduino R3 Board Power Bank - Instrument Parts & Accessories - AliExpress
Amazon.com: AURSINC ESP8266 Development Board DSTIKE WiFi Deauther OLED V6 with Battery Charging System | OLED Display | 3 Way Momentary Slide Switch : Electronics
Design your own ESP Board for Battery Powered IoT Applications