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Re: charging policy

From Frank Slootweg <this@ddress.is.invalid>
Newsgroups comp.mobile.android
Subject Re: charging policy
Date 2018-11-23 19:52 +0000
Organization NOYB
Message-ID <pt9p57.deo.1@ID-201911.user.individual.net> (permalink)
References (5 earlier) <WwElr2JSbt9bFwPQ@255soft.uk> <pt6okf$7uh$1@dont-email.me> <pt70nn.dsc.1@ID-201911.user.individual.net> <i7IYp1Uj$x9bFwJC@255soft.uk> <pt9cf2.b6s.1@ID-201911.user.individual.net>

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Eralier today, I wrote:
> "J. P. Gilliver (John)" <G6JPG-255@255soft.uk> wrote:
> > In message <pt70nn.dsc.1@ID-201911.user.individual.net>, Frank Slootweg 
> > <this@ddress.is.invalid> writes:
> > []
> > >  N.B. In the off chance that some of you didn't, ignore nospam's
> > >comments that limiting charging to between XX and 80/90% "is not worth
> > >the small benefit"/"an extra month or two over 3-5 years". His nonsense
> > >has been debunked several times before, but of course, being the
> > >compulsive arguer that he is, he denies that fact and just starts yet
> > >another loop of non-discussion.
> > 
> > What difference do _you_ say it makes? Leaving laptop permanently 
> > plugged in has what effect on battery capacity after 3-5 years - 20%? 
> > 50%? 80%? 95% (i. e. kills it)?
> 
>   I thought I kept some pointers to the past discussions, but maybe I
> didn't or at least I can't re-find them.

  I couldn't stand that I hadn't kept/remembered any pointers, so I
checked my Posted file for clues.

  This led to the following recent history:

- DDJUN2018 thread "Advice on maximising lifetime (charge cycles) of
  laptop battery" in alt.comp.os.windows-10.

- 16MAR2018 thread "charging to 80 or 90%" (122 articles!) in
  comp.mobile.android.

  In this latter thread, Libor Striz posted many times on this subject.

  I didn't check all his posts, but I think this was one of the most
important references:

'BU-808: How to Prolong Lithium-based Batteries'
<https://batteryuniversity.com/index.php/en/learn/article/how_to_prolong_lithium_based_batteries>

  And specifically the Table 2 'Depth of Discharge':

<quote>

Depth of discharge	Discharge cycles
			(NMC / LiPO4)

100% DoD		  ~300 /   600 
 80% DoD		  ~400 /   900 
 60% DoD		  ~600 / 1,500 
 40% DoD		~1,000 / 3,000 
 20% DoD		~2,000 / 9,000 
 10% DoD		~6,000 / 15,000 

Table 2: Cycle life as a function of
depth of discharge.*  A partial discharge
reduces stress and prolongs battery life,
so does a partial charge. Elevated
temperature and high currents also affect
cycle life.

Note: 100% DoD is a full cycle; 10% is
very brief. Cycling in mid-state-of-charge
would have best longevity.

</quote>

  This reference describes it much better than my explanation
(quoted below).

  So you can see that for a 40% DoD, you get upto five times as many
cycles.
  Normalized to full (100% cycles) that means (40/100)*(3000/600) = 2
times as many full/100% cycles. Or IOW, 2 times as much total power (in
Ah) over the life of the battery.

  So take your pick: (For example) Battery University's expertise versus
nospam's.

[My explanation left for reference:]

>   So this is from memory. AFAIR, the total number of charge-discharge
> cycles - recalculated to normal full/empty cycles - can be increased by
> a factor of two or more, when charging-discharging between XX and YY%,
> where XX is (substantially) more than 0 and YY is 90 or less.
> 
>   Let's say a normal cycle is 10-100% and back and the battery would
> last 1000 cycles, then using a cycle of say 35-80%, the battery would
> last at least 4000 cycles, i.e. 90,000% versus 180,000% total charge.
> 
>   I'm sure Libor Striz has some authoritative references readily
> available.

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Thread

charging policy "Linea Recta" <bleep.bleep@bleep.invalid> - 2018-11-21 18:24 +0100
  Re: charging policy Andy Burns <usenet@andyburns.uk> - 2018-11-21 17:36 +0000
    Re: charging policy Libor Striz <poutnik4REMOVEnntp@CAPITALSgmail.com.INVALID> - 2018-11-21 19:02 +0100
      Re: charging policy nospam <nospam@nospam.invalid> - 2018-11-21 15:10 -0500
  Re:charging policy Libor Striz <poutnik4REMOVEnntp@CAPITALSgmail.com.INVALID> - 2018-11-21 18:53 +0100
    Re: Re:charging policy Frank Slootweg <this@ddress.is.invalid> - 2018-11-21 18:42 +0000
    Re: charging policy nospam <nospam@nospam.invalid> - 2018-11-21 15:10 -0500
      Re: charging policy Libor Striz <poutnik4REMOVEnntp@CAPITALSgmail.com.INVALID> - 2018-11-22 07:13 +0100
        Re: charging policy nospam <nospam@nospam.invalid> - 2018-11-22 01:50 -0500
          Re: charging policy Libor Striz <poutnik4REMOVEnntp@CAPITALSgmail.com.INVALID> - 2018-11-22 09:15 +0100
            Re: charging policy "J. P. Gilliver (John)" <G6JPG-255@255soft.uk> - 2018-11-22 16:09 +0000
            Re: charging policy nospam <nospam@nospam.invalid> - 2018-11-22 11:57 -0500
          Re: charging policy "J. P. Gilliver (John)" <G6JPG-255@255soft.uk> - 2018-11-22 16:18 +0000
            Re: charging policy nospam <nospam@nospam.invalid> - 2018-11-22 11:57 -0500
              Re: charging policy "J. P. Gilliver (John)" <G6JPG-255@255soft.uk> - 2018-11-22 17:26 +0000
                Re: charging policy nospam <nospam@nospam.invalid> - 2018-11-22 12:54 -0500
                Re: charging policy "J. P. Gilliver (John)" <G6JPG-255@255soft.uk> - 2018-11-22 21:26 +0000
                Re: charging policy nospam <nospam@nospam.invalid> - 2018-11-23 01:14 -0500
                Re: charging policy Andy Burns <usenet@andyburns.uk> - 2018-11-23 09:28 +0000
                "tl; dr" (was: Re: charging policy) "J. P. Gilliver (John)" <G6JPG-255@255soft.uk> - 2018-11-23 15:28 +0000
                Re: charging policy 123456789 <12345@12345.com> - 2018-11-22 18:39 -0700
            Re: charging policy 123456789 <12345@12345.com> - 2018-11-22 10:22 -0700
              Re: charging policy Frank Slootweg <this@ddress.is.invalid> - 2018-11-22 18:45 +0000
                Re: charging policy nospam <nospam@nospam.invalid> - 2018-11-22 13:47 -0500
                Re: charging policy "NY" <me@privacy.net> - 2018-11-22 20:40 +0000
                Re: charging policy David Higton <dave@davehigton.me.uk> - 2018-11-22 21:29 +0000
                Re: charging policy 123456789 <12345@12345.com> - 2018-11-22 18:39 -0700
                Re: charging policy 123456789 <12345@12345.com> - 2018-11-22 18:39 -0700
                Re: charging policy "J. P. Gilliver (John)" <G6JPG-255@255soft.uk> - 2018-11-22 21:30 +0000
                Re: charging policy nospam <nospam@nospam.invalid> - 2018-11-23 01:14 -0500
                Re: charging policy "J. P. Gilliver (John)" <G6JPG-255@255soft.uk> - 2018-11-23 15:26 +0000
                Re: charging policy Frank Slootweg <this@ddress.is.invalid> - 2018-11-23 16:13 +0000
                Re: charging policy Frank Slootweg <this@ddress.is.invalid> - 2018-11-23 19:52 +0000
                Re: charging policy Frank Slootweg <this@ddress.is.invalid> - 2018-11-23 21:29 +0000
                Re: charging policy nospam <nospam@nospam.invalid> - 2018-11-23 16:40 -0500
                Re: charging policy "J. P. Gilliver (John)" <G6JPG-255@255soft.uk> - 2018-11-23 21:48 +0000
                Re: charging policy nospam <nospam@nospam.invalid> - 2018-11-23 17:06 -0500
                Re: charging policy "J. P. Gilliver (John)" <G6JPG-255@255soft.uk> - 2018-11-23 22:09 +0000
                Re: charging policy nospam <nospam@nospam.invalid> - 2018-11-23 17:23 -0500
                Re: charging policy The Real Bev <bashley101@gmail.com> - 2018-11-23 21:00 -0800
                Re: charging policy nospam <nospam@nospam.invalid> - 2018-11-24 09:05 -0500
                Re: charging policy Frank Slootweg <this@ddress.is.invalid> - 2018-11-24 15:46 +0000
                Re: charging policy nospam <nospam@nospam.invalid> - 2018-11-24 10:51 -0500
                Re: charging policy 123456789 <12345@12345.com> - 2018-11-24 10:01 -0700
                Re: charging policy nospam <nospam@nospam.invalid> - 2018-11-24 12:55 -0500
                Re: charging policy 123456789 <12345@12345.com> - 2018-11-24 13:07 -0700
                Re: charging policy nospam <nospam@nospam.invalid> - 2018-11-24 16:33 -0400
                Re: charging policy 123456789 <12345@12345.com> - 2018-11-24 18:52 -0700
                Re: charging policy nospam <nospam@nospam.invalid> - 2018-11-25 00:42 -0500
                Re: charging policy 123456789 <12345@12345.com> - 2018-11-25 11:33 -0700
                Re: charging policy "J. P. Gilliver (John)" <G6JPG-255@255soft.uk> - 2018-11-25 19:06 +0000
                Re: charging policy nospam <nospam@nospam.invalid> - 2018-11-25 14:46 -0500
                Re: charging policy 123456789 <12345@12345.com> - 2018-11-25 19:37 -0700
                Re: charging policy nospam <nospam@nospam.invalid> - 2018-11-25 22:07 -0500
                Re: charging policy "J. P. Gilliver (John)" <G6JPG-255@255soft.uk> - 2018-11-26 04:46 +0000
                Re: charging policy nospam <nospam@nospam.invalid> - 2018-11-26 00:32 -0500
                Re: charging policy 123456789 <12345@12345.com> - 2018-11-25 22:37 -0700
                Re: charging policy nospam <nospam@nospam.invalid> - 2018-11-25 14:46 -0500
                Re: charging policy 123456789 <12345@12345.com> - 2018-11-25 19:37 -0700
                Re: charging policy Frank Slootweg <this@ddress.is.invalid> - 2018-11-26 15:45 +0000
                Re: charging policy nospam <nospam@nospam.invalid> - 2018-11-26 10:49 -0500
                Re: charging policy 123456789 <12345@12345.com> - 2018-11-26 16:04 -0700
                Re: charging policy nospam <nospam@nospam.invalid> - 2018-11-26 19:11 -0500
                Re: charging policy Frank Slootweg <this@ddress.is.invalid> - 2018-11-24 20:14 +0000
                Re: charging policy 123456789 <12345@12345.com> - 2018-11-24 18:52 -0700
                Re: charging policy nospam <nospam@nospam.invalid> - 2018-11-25 00:42 -0500
    Re: charging policy Anssi Saari <as@sci.fi> - 2018-11-26 10:36 +0200
      Re: charging policy "J. P. Gilliver (John)" <G6JPG-255@255soft.uk> - 2018-11-26 16:37 +0000
  Re: charging policy nospam <nospam@nospam.invalid> - 2018-11-21 15:10 -0500
  Re: charging policy 123456789 <12345@12345.com> - 2018-11-21 15:01 -0700

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