On Thu, May 17, 2018 at 6:21 PM, Chris Murphy <li...@colorremedies.com> wrote:
> On Thu, May 17, 2018 at 6:00 PM, Fred Smith
> <fre...@fcshome.stoneham.ma.us> 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.
And this morning, again powered off and unplugged overnight.
energy-full: 27.2041 Wh
energy-full-design: 38.115 Wh
I'm gonna use it in battery all day and let it discharge entirely and
charge it from that state, and see if any of this changes.
--
Chris Murphy
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