I have device which is used commonly by a layman kin. She does not really understand, why spares the battery if we do not wait until it goes to zero. She thinks, the device needs charge only if it was powered off due to battery exhaustion. I have no way to change her mind, but I can install or set up on her (non-rooted) Android as I want to (including adb access, if needed).

I think, maybe some app could power off her phone if battery level goes under, for example, 35% or so. Alternatively, maybe the battery load calibration could be changed to consider the actual battery level lower as it really is.

What to do?

  • The command to shutdown the device requires root permissions. The battery calibration is as far as I know done by the battery controller itself. You may be able to clear the data but manipulate? I don't see a different way than to educate her. May be be she can only learn it the hard way if the battery dies or the flash memory gets corrupted if the phone is not able to shut down before the power is gone. – Robert Nov 10 '20 at 21:03
  • @Robert Also education is going on, but it is more hard as sounds logical. Thanks! What if an app annoys the user by "low battery" popups? And, maybe, even in audio form? – peterh - Reinstate Monica Nov 10 '20 at 21:43
  • @Robert I could also control the phone over adb, and inject touch events into. This would be a way to power it off without root. But I do not want to hack her, I only want to spare the battery :-) – peterh - Reinstate Monica Nov 10 '20 at 22:47
  • Without root, it's not possible because battery status is shown across launcher & all apps. There are gimmicky apps on Play Store (search for fake battery) that merely throw up a warning but that's not going to help as the person would soon discover //Try comparing battery to a human being while educating - being starved followed by being fully fed doesn't make an efficient person, it's eating less and much before you are very hungry or totally depleted //Likewise eating till you can't eat anymore doesn't help// see this – beeshyams Nov 11 '20 at 6:25
  • How deep does the battery goes (in percent) before the device shuts down? Is the device charged on "off state" or is it on/booted? If the device is charged while fully booted I may have a working idea. – Robert Nov 11 '20 at 8:07

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