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Re: how to control battery charge level on a laptop
On 2025年10月22日, Henry wrote:
1) design capacity is said to be 5.376Ah, but written directly on the
battery is 7.7V, 41Wh (=~5.324Ah) and nominal 5350mAh. While small, the
battery is being overcharged to 5.376Ah (101%). Is there a way to
correct the design capacity to 5.324Ah, and force the machine to keep
the charge no higher than 5.324Ah?
You can't change the design capacity. `last full cap' will decrease as the
battery ages.
2) the CritMax and WarnMax entries are blank. Is there a way to
inform the machine of these parameters, and issue a warning and stop
charging the machine until the issue is resolved?
You can, at least, be informed when your thresholds (low, high) are reached.
See: https://www.unitedbsd.com/d/401-help-me-understand-a-thing-or-two/30
and envsys.conf(5).
3) the WarnMin and CritMin for charge are 12.091% and 7.068%. What
actions are taken, if any, when these levels are reached?
Messages are logged to syslog. See: /etc/powerd/scripts/sensor_battery
-RVP
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