Tinkermax shows us how he reduce the current consumption of his v2 NodeMCU in deep sleep to < 50μA:
Unfortunately, with all this added convenience comes the drawback of added power consumption, which continues even when the ESP8266 is in deep sleep.
I measured 18mA to the NodeMCU board while the ESP8266 was in deep sleep mode – orders of magnitude more power hungry than I was looking for.
So for my project (which I will write up for my next blog post) I sought to retain the convenience of using the NodeMCU, but to address its power consumption shortcomings to allow battery operation.
Read further to hear what I did.
Full details at Tinkermax’ blog.