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IoT with ESP8266: 18650 Li-Ion battery powered Wemos D1 with Wemos Battery Shield - DONE 48 days achieved
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Amazon.com: OCESTORE Mini D1 Module Wemos D1 ESP8266 with Battery Slot ESP WROOM 02 Motherboard Compatible with Node-MCU : Electronics
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Mads Chr. Olesen Offers a "Quick and Dirty" Guide to Battery-Powered Wemos LOLIN D1 Mini Projects - Hackster.io
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