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From: Frank Slootweg <this@ddress.is.invalid>
Newsgroups: comp.mobile.android
Subject: Re: is my phone ON or is it OFF?
Date: 25 Apr 2024 13:55:21 GMT
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Jeff Layman <Jeff@invalid.invalid> wrote:
[...]

> The charging circuitry is within the battery itself. It controls the 
> rate of charge and, in particular, monitors the temperature of the 
> cell(s). If it gets too high it will stop the charging. Note though, 
> that the connection from the phone's charger socket (lightning, USB, or 
> whatever) goes through some of the phone's circuitry, so the phone knows 
> the state of charge of its battery. That way its % charge can be 
> displayed on the phone's screen, and battery-usage apps can let you know 
> what's being used and how long the phone might last before recharging is 
> essential.

  The fact that the phone is charging and how full its battery is, is
also displayed/displayable when the phone is switched 'off'.

  Ergo, the phone is never really off. It's either awake or sleeping
during normal use or in cold standby when the user switched it 'off'.

[...]