1btn is a Battery Powered Open Source ESP8266 WiFi Button - CNX Software
Can i power this 'nodemcu esp8266 v3' using 7.4v or 8v power source in its microusb. actually i have two li-ion battery(3.7v) so , i am going to connect this battery in
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Power Supply for NodeMCU with Battery Charger & Booster
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lua - Check the battery status with NodeMCU? - Stack Overflow
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18650 Battery Shield V8 Mobile Power Bank 3V/5V for Arduino ESP32 ESP8 – diymore
