WeMos D1 ESP Mainboard ESP8266 Mini-WiFi Nodemcu Modul 18650 Akku DIY
7,29 €
You can call it "WiFi battery". I am going to make it easier to develop ESP8266 ESP8266 project to add 18650 battery. This miniature board can solve this problem. LG 3000mah 18650 battery can make ESP8266 run for 17 hours or more.
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