Add battery charger to ESP8266 and ESP32 (well done) - eMariete
Power Supply for NodeMCU with Battery Charger & Booster
Pin on ESP8266
ESP8266 Thing Hookup Guide - SparkFun Learn
Mini ESP8266 Wifi Development Board 18650 Lithium Battery Charging Module I2C | eBay
Battery-Powered ESP8266 Sensor? Never Been Simpler | Hackaday
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ACROBOTIC WeMos ESP8266 D1 Mini TP5410 Lithium Battery Charging and Boost Shield for Arduino NodeMCU Raspberry Pi Wi-Fi IoT : Amazon.in: Computers & Accessories
Amazon.com: CANADUINO WEMOS D1 Mini ESP8266 WiFi Lithium Battery Shield V1.1.0 with 5V Booster : Electronics
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