On Thu, May 17, 2018 at 06:21:07PM -0600, Chris Murphy wrote:
> On Thu, May 17, 2018 at 6:00 PM, Fred Smith
> <fredex@xxxxxxxxxxxxxxxxxxxxxx> wrote:
> > On Thu, May 17, 2018 at 05:08:42PM -0600, Chris Murphy wrote:
> >> Check this out. After fully charging from this morning?
> >>
> >> [chris@f28h ~]$ upower -i /org/freedesktop/UPower/devices/battery_BAT1
> >> native-path: BAT1
> >> vendor: Hewlett-Packard
> >> model: PABAS0241231
> >> serial: 41167
> >> power supply: yes
> >> updated: Thu 17 May 2018 04:59:54 PM MDT (14 seconds ago)
> >> has history: yes
> >> has statistics: yes
> >> battery
> >> present: yes
> >> rechargeable: yes
> >> state: fully-charged
> >> warning-level: none
> >> energy: 29.1522 Wh
> >> energy-empty: 0 Wh
> >> energy-full: 29.1522 Wh
> >> energy-full-design: 38.115 Wh
> >> energy-rate: 0 W
> >> voltage: 8.671 V
> >> percentage: 100%
> >> capacity: 76.4848%
> >> technology: lithium-ion
> >> icon-name: 'battery-full-charged-symbolic'
> >>
> >> [chris@f28h ~]$
> >>
> >> How does capacity go from 82.68% this morning to 76.48% this
> >> afternoon? This laptop is ~18 months old.
> >
> > Doesn't make sense, unless this morning it was "percentage" that was 82.68,
> > not "capacity". (I've certainly misread things like that, and this stuff
> > is hard to understand because there are no explanations given.)
> >>
> >> [root@f28h ~]# cat /sys/class/power_supply/BAT1/cycle_count
> >> 0
> >>
> >> That's obviously bogus. I'd say 75% of the time I'm working on power,
> >> the other 25% or less of the time it's running on battery. It gets
> >> battery usage once a week or so.
> >
> > I think what that means is that the battery design was such that when
> > new the battery would hold 38.115 Wh, but it has now degraded so that
> > it only holds 29.1522 Wh.
> >
> > if you divide 29.1522/38.115 you get 0.764848, hence the "capacity"
> > now that it has aged a year and a half, is 76.4848% of the original 38.115.
> >
> > You'll notice that "capacity" is 100%, which means it's fully charged
> > for its current place in the battery lifetime curve, i.e., 29.1522 Wh.
> >
> > Lithium Ion batteries age like that, its normal. Eventually you get
> > fed up with it and buy a new battery or a new laptop (or phone or
> > whatever gizmo we're talking about). The very reason why after a lot of
> > customer furor, Apple agreed to replace iphone batteries cheaply rather
> > than raking all those customers of the coals of overly-priced replacement
> > batteries.
>
>
> First posting for this thread is from this morning:
>
> energy-full: 31.5161 Wh
> energy-full-design: 38.115 Wh
> ...
> percentage: 86%
> capacity: 82.6869%
>
>
> And this afternoon.
>
> energy-full: 29.1522 Wh
> energy-full-design: 38.115 Wh
> ...
> percentage: 100%
> capacity: 76.4848%
>
>
> Somehow energy-full has changed quite a bit in just 1/2 a day.
my guess is it jumps in discrete "quanta", at least as reported, rather
than microscopic amounts. but I haven't watched mine closely enough
to see.
--
---- Fred Smith -- fredex@xxxxxxxxxxxxxxxxxxxxxx -----------------------------
"For him who is able to keep you from falling and to present you before his
glorious presence without fault and with great joy--to the only God our Savior
be glory, majesty, power and authority, through Jesus Christ our Lord, before
all ages, now and forevermore! Amen."
----------------------------- Jude 1:24,25 (niv) -----------------------------
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