Date: Fri, 17 May 2019 09:05:19 +0200 From: Matthias Apitz <guru@unixarea.de> To: freebsd-questions@freebsd.org Cc: freebsd-mobile@freebsd.org Subject: calibrating a laptop battery Message-ID: <20190517070519.GA9987@sh4-5.1blu.de>
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Hello, Background: I have an Acer C720 netbook (selled as a so called Chromebook, but running CURRENT fine) and after some year of usage (since 2015) I bought a new battery, original from Acer (as least claimed by the dealer as original). When the battery was installed, FreeBSD showed this with 'sysctl -n hw.acpi.battery.life' as 100% charged. I was told, I have to 'calibrate' it with the procedure: let it run out of energy without power supply, and charge it again to 100%. But magically it charges only up to 75% when the blue LED says "fully charged", and each day this point goes up 1% more, i.e. LED goes blue next day with 76%, the day after 77% and so on until somewhere around 96%. When I fully discharge it again (i.e. using it on the road until nearly power-off), this process starts again with 75%. I was told in a thread in the Acer forum https://community.acer.com/en/discussion/567420/acer-c720-battery-hassles a lot of things, even Windows hints (I saif FreeBSD) or a magic hole in the bottom of the case (which is not there in the Acer C720) and among others they pointed to an Ubuntu tool http://manpages.ubuntu.com/manpages/xenial/man8/power-calibrate.8.html Questions: 1) What does the word "calibrate battery" means technically? 2) Do we have something in FreeBSD to do 1) 3) Any other ideas about this issue? Thanks matthias -- Matthias Apitz, ✉ guru@unixarea.de, http://www.unixarea.de/ +49-176-38902045 Public GnuPG key: http://www.unixarea.de/key.pub May, 9: Спаси́бо освободители! Thank you very much, Russian liberators!
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