doc: battery: some batteries enter "unknown" under normal operation

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Daniel Eklöf 2021-10-31 21:07:09 +01:00
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@ -8,6 +8,17 @@ battery - This module reads battery status
This module reads battery status from _/sys/class/power_supply_ and
uses *udev* to monitor for changes.
Note that it is common (and "normal") for batteries to be in the state
*unknown* under certain conditions.
For example, some have been seen to enter the *unknown* state when
charging and the capacity reaches ~90%. The battery then stays in
*unknown*, rather than *charging*, until it has been fully charged and
enters the state *full*.
This does not happen with all batteries, and other batteries may enter
the state *unknown* under other conditions.
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