EDIT2: Don't use 5V to VIN but 3V(Shield) to 3V(NodeMCU) for voltage measuring.

Ok, thank you very much!
Last question: For deep sleep mode I set up sleep time in config and connect D0/GPIO16 to RST and NodeMCU comes up periodically to send values?

Yes, I'm using a recent _ESP8266_4096_VCC.bin - so this value should decline rapidly when battery starts to empty, right? So no information how much percentage or mAh left.

grovkillen wrote: ↑14 Jan 2019, 11:59 Sounds about right. The VCC reported via the Analog is what the ESP is "seeing" and the ESP is working on 3.3V.

Thanks for your fast reply grovkillen, but I didn't connect anything on A0 - so I don't know how this measurement comes from.

Hi there, this is my first post so please be nice to me ;) - I own a NodeMCU v3 and flashed a _VCC build to it. - I have a 18650 battery shield v3 with USB-A, 5V out and 3V out. I want to use NodeMCU v3 with this "shield" and I really don't know how to wire this correctly (I guess 5V Shiel...