for live battery for corby and corby txt

Reduce Brighnest
Reduce his ability brightnest will make Corby we will be more durable.
Settings -> Display and Light -> Brightness (change to level 2)

Accelerating the Backlight time
Maybe this will be a bit disturbing, but by shortening the active screen time will affect the ability bettery
Settings -> Display and Light -> Back light time (set up to you, between 8 sec - 15 sec)

For Corby TXT
how custom keypad light, switch night time only.
settings>> display and light>> keypad light
there are three modes: if i select custom (can set the time when his active keypad light