There is already a good thread on those - Battery model recommendation. I ended up getting some protected 3500mAh cells. I got the protected ones, not because the DevTerm/uConsole needs it (it has a proper battery charging circuit) but it just means i can use them fairly universally in my overall 18650 stash.
Depending of what is needed by uconsole 4 AA batteries should be able to provide 5V but what about current?
What I meant was that you can get the voltage by putting them in series but the uConsole and DevTerm (I’m pretty sure) run the 2x 18650s in parallel so you get 7000mAh from the cells I use. Getting the same out of the AAs is greatly going to reduce the total capacity.