Let us say, you made a small project where you need to leave one of these boards below in the middle of nowhere with only battery power.
What kind of connector would you use between this board and the battery?
How do you guys go about powering a board like this for standalone, battery operated situations?
(Right now, it runs off the power that it gets through micro usb cable)
First approximation, if you have battery, feed battery voltage to a buck converter set to the voltage the ESP needs. That means your ESP won't see declining voltage as the battery discharges.
But I'm no low-power, battery guru. Others will contribute, I'm sure.