I would like to power a Wemos D1 mini with AA batteries for a project.
I'm really new to the subject but as I understood the board runs with 3.3V. You can power the board through the 5V pin because there is a built in dropout there.
To get 5V I thought of using 4 AA batteries (4 x 1.5 = 6V) and mount them with a resistor to lower the voltage to 5V.
What I don't understand is how the resistor is acting on the overall system. Does it increase its lifetime or does it disperse all extra voltage into heat ? In other words, if I use more batteries with bigger resistor, does my circuit gets longer lifetime or should I stick to the required voltage ?
As I understood I could use 3 AA batteries (4.5V) it would work but I would opt for more lifetime if possible (Also I already bought boxes for 4 batteries ;) ).
Is there any best pattern to decrease voltage effectively ? (Diodes, ..., ?).