Bookworm 6.12.y for the uConsole and DevTerm

[white-round-square]

@ditas

It turns off at about 55-60% of battery left and then turns on only if I plug it to the wall.

you can try to recalibrate batteries: Bookworm 6.6.y for the uConsole and DevTerm - #164 by Rex

(or you can cycle them in external charger if you have one)