I mentioned in post 2 that I have 2 battery powered nodemcu/ds1b20 combis and that “I have no idea yet how long the battery powered nodemcu’s will hold.”
Now I know: Less than a week. I assume the development boards use way more “power” then the tiny esp-01 modules.
I had already tried with USB power banks but the 2 different power banks I have switch off when the equipment doesn’t draw power (when in sleep mode).