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
Adventures in deep sleep with ESP8266 and a temperature sensor – Tomás McGuinness
NodeMCU battery voltage status - Need Help With My Project - Blynk Community