In my weather station, I use a Wemos D1 mini powered directly by a 2,400mAh 18650-size li-ion battery. The Wemos, unlike the nodeMCU, has a low-dropout regulator so can run directly from the battery and this maximises the battery life. It lasts 10~12 weeks because the esp8266 goes into deep sleep for 15 minutes, wakes for 5~10 seconds to read sensors and transmit data, then back to sleep. Unfortunately, my wind and rain sensors are "dumb" and need constant monitoring while the esp is in deep sleep, so I had to use an attiny85 for that, and this was the most difficult part of the project.
Thx for the info ill look into that
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