On Wed, 11 Apr 2018 18:30:58 +0100 Danny Horne via users <users@xxxxxxxxxxxxxxxxxxxxxxx> wrote: > On 11/04/18 18:26, Dave Stevens wrote: > > On Wed, 11 Apr 2018 18:12:04 +0100 > > Danny Horne via users <users@xxxxxxxxxxxxxxxxxxxxxxx> 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/notebooks.html http://web.archive.org/web/20141018162218/http://support.apple.com/kb/HT1490 Good luck, and Regards! -- Wolfgang Pfeiffer _______________________________________________ users mailing list -- users@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe send an email to users-leave@xxxxxxxxxxxxxxxxxxxxxxx
