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