On Wed, 11 Apr 2018 18:30:58 +0100
Danny Horne via users <users(a)lists.fedoraproject.org> wrote:
On 11/04/18 18:26, Dave Stevens wrote:
> On Wed, 11 Apr 2018 18:12:04 +0100
> Danny Horne via users <users(a)lists.fedoraproject.org> wrote:
>
>> From comments received so far it's looking like a battery replacement.
> why not do the test first and spend the money later?
>
> d
> _______________________________________________
>
I have no intentions of spending any money just yet!! If it needs a new
battery it's going to have to wait.
I like that approach ... :)
Plus: I don't trust the the battery values indicated by the OS too
much: one example: I have a battery in a Dell notebook that the system
says has a 100% capacity, but still the notebook drains down the
device in a running system until ~ 54%, and then in the next minute or
so, it's on 0%. That doesn't seem right.
You can still try to train the battery for longer run-time
capabilities: basically I do that by running the computer on battery
until the system says the battery is near zero or actually zero. Only
then, and quickly, I re-plug the power cable to the machine.
I've heard people saying that's the wrong approach, but it seems my
batteries know better: for example I drained the mentioned battery in
the last days a few times, and it seems the "time until empty" from full
went from barely ~60 minutes to ~80 mins. And I probably will keep
trying that ...
I try monitoring the battery status while draining the device with a
command like this:
watch -dc 'upower -i /org/freedesktop/UPower/devices/battery_BAT1| grep -E
"present|state|to\ full|percentage|capacity|time\ to empty|time\ to
full|technology"
(an edit of what Robbi Nespu was mentioning in this thread)
or this:
watch 'grep -Ei "(capacit|charge)" /sys/class/power_supply/BAT1/uevent'
A safer way to do the drain might be while running the machine in BIOS: I
have something like a hardware test in BIOS: I start that and unplug the
machine: this test takes a lot of power, it seems, and it drains the battery
fast.
And yes, I know: even 80 mins is a lousy run-time for a battery. But
IIRC it wasn't even very good after I bought the computer ~4 yrs ago ...
There are a few guides made by Apple on how to train batteries -
they're not active anymore on
apple.com it seems - the archived
versions still are:
https://web.archive.org/web/20140729195527/http://www.apple.com/batteries...
http://web.archive.org/web/20141018162218/http://support.apple.com/kb/HT1490
Good luck, and Regards!
--
Wolfgang Pfeiffer