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.
--
Chris Murphy
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