IoT with ESP8266: 18650 Li-Ion battery powered Wemos D1 with Wemos Battery Shield - DONE 48 days achieved
Create Your Own ESP8266 Shields | Hackaday
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WeMos D1 (esp8266) Ebyte LoRa shield (10Km) with HardwareSerial and voltage regulator - Share Project - PCBWay
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Amazon.com: Onyehn 4pcs for Wemos D1 Mini Battery Shield Micro USB Single Lithium Battery Charging Boost Module with Pins LED Indicator 5V 1A DC : Electronics