1

I have 2 devices: one with Android 4.2.1 (Emotion UI 1.6), one with Android 5.1.

Android 4 device has an option in "developers" settings to always keep screen turned on while charging. Android 5 device seems not have "developers" settings at all, and I couldn't find such an option to keep screen turned on while charging anywhere.

Could I somehow tell my Android 5.1 device not to turn off the screen after timeout, when charger is plugged?

3

This option is still there in developer settings. Those settings have just been hidden since around Android 4.2/4.3. Our developer-options tag-wiki shows you how to enable them:

  1. Go to Settings → About
  2. tap the Build number entry 7 times (hammering the item)
  3. Go back to the Settings main page, Developer Settings should now be visible

In there you'll now find the option to "keep display on".

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