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Re: Laptop battery loses charge when off??

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Somewhere on teh intarwebs micky wrote:
> On Thu, 14 Mar 2013 19:17:03 +1300, "~misfit~"
> <shaun.at.pukekohe@gmail.com> wrote:
>
>> Somewhere on teh intarwebs micky wrote:
>>> On Sun, 24 Feb 2013 01:57:04 -0500, micky <NONONOmisc07@bigfoot.com>
>>> wrote:
>>>
>>>> Why are my laptops discharging when hibernated?
>>>
>>> I came across some info on this, straight from Acer, which is the
>>> brand of laptop I have.
>>> http://acer.custhelp.com/app/answers/detail/a_id/2384/session/L3RpbWUvMTM2MzE0MTQwMi9zaWQvaVN4N0Eqa2w%3D
>>>
>>> "Storing the battery:
>>>
>>> Do not charge up a battery, and then store it away. A stored battery
>>> should be used every three to four weeks. Let the battery fully
>>> discharge, then recharge to 40% if you plan to store it again. If
>>> you store a battery for longer than three to four weeks, the
>>> battery could fully discharge because the battery circuitry itself
>>> consumes power.
>>>
>>> "because the battery circuitry itself consumes power"!!!!!!!
>>
>> Yes, this has been the case for well over a decade now.
>
> I just checked my emails from 10 years ago, and no one wrote me about
> this.

Are you in the field of battery back design and management then?

>> The 'battery' is a
>> collection of Li-Ion cells and some 'smart' circuitry which, amongst
>> other things, monitors the state of each cell and attempts to level
>> the load so that one cell aging prematurely doesn't take out the
>> whole battery pack.
>
> That sounds great, but it should do it for free.  "I paid for this
> battery."


All electronic circuits need to use power from somewhere. There's no such 
thing as a free electron.

>> Also the PU in the battery keep track of things like the serial
>> number of the battery, the number of cycles it's undergone and the
>> general health of the cells / battery. If there isn't enough power
>> left to keep the PU powered up then your battery is bricked - even
>> if the cells are in 90% good condition!
>
> Sounds like too much regulation,  government regulation..

Ok, are you.... Confused? It has nothing to do with governments. Without 
this smart battery management you'd be lucky to get 3 months from a battery 
pack. As it is I have 10 year old IBM X3x batteries that are only showing as 
haing a 20% wear level. That's phenomenal and completely impossible without 
the circuitry that monitors the cells, their temps when charging (and 
adjusts the charge current accordingly) and a bunch of other things.

>> It's for this reason that, if you're going to re-pack a battery you
>> need to apply a source of current to the PU and associated circuitry
>> before you disconect the old cells. I've seen it done, a bench-top
>> variable PSU and a couple leads with crocodile clips.... Clip them
>> in just the right place with just the right voltage dialed in and
>> then, and only then - you can remove the old cells and solder in new
>> ones. Of course if the old battery's already bricked due to zero
>> current then you're SOOL.
>
> That selttles it.  I'm not rebuilding any battery packs.

I might try it - if only because most of my machines don't have battery 
packs available off-the-shelf so anything I buy is going to be not only 
expensive but of iffy quality (and re-quire a non-bricked trade. If you do 
it yourself you can buy high-quality Japanese cells rather than commodity 
Chinese cells and end up with a battery pack that's can hold quite a bit 
more charge than the new one and wil last a good long time. can't be said 
for 80% of available re-builds.

>> It's not rocket science.
>
> I never said my limit was rocket science.  It's far below that.

LOL, me too.

> Thanks.

You're welcome.
-- 
/Shaun.

"Humans will have advanced a long, long, way when religious belief has a 
cozy little classification in the DSM."
David Melville (in r.a.s.f1) 

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Thread

Laptop battery loses charge when off?? micky <NONONOmisc07@bigfoot.com> - 2013-02-24 01:57 -0500
  Re: Laptop battery loses charge when off?? Computer Nerd Kev <not@telling.you> - 2013-02-24 09:04 +0000
    Re: Laptop battery loses charge when off?? Bert <bert@iphouse.com> - 2013-02-24 15:41 +0000
      Re: Laptop battery loses charge when off?? micky <NONONOmisc07@bigfoot.com> - 2013-02-24 14:29 -0500
    Re: Laptop battery loses charge when off?? micky <NONONOmisc07@bigfoot.com> - 2013-02-24 14:22 -0500
  Re: Laptop battery loses charge when off?? Bob_Villa <pheeh.zero@gmail.com> - 2013-02-24 06:27 -0800
    Re: Laptop battery loses charge when off?? micky <NONONOmisc07@bigfoot.com> - 2013-02-24 14:37 -0500
  Re: Laptop battery loses charge when off?? Charlie Hoffpauir <invalid@invalid.com> - 2013-02-24 09:21 -0600
    Re: Laptop battery loses charge when off?? micky <NONONOmisc07@bigfoot.com> - 2013-02-24 14:40 -0500
  Re: Laptop battery loses charge when off?? micky <NONONOmisc07@bigfoot.com> - 2013-03-12 23:17 -0400
    Re: Laptop battery loses charge when off?? "~misfit~" <shaun.at.pukekohe@gmail.com> - 2013-03-14 19:17 +1300
      Re: Laptop battery loses charge when off?? micky <NONONOmisc07@bigfoot.com> - 2013-03-14 12:48 -0400
        Re: Laptop battery loses charge when off?? "~misfit~" <shaun.at.pukekohe@gmail.com> - 2013-03-15 13:15 +1300
    Re: Laptop battery loses charge when off?? Top <top1sg@suddenlink.invalid> - 2013-03-16 16:45 -0500
      Re: Laptop battery loses charge when off?? micky <NONONOmisc07@bigfoot.com> - 2013-03-16 18:31 -0400
        Re: Laptop battery loses charge when off?? not@telling.you.invalid (Computer Nerd Kev) - 2013-03-16 23:42 +0000
          Re: Laptop battery loses charge when off?? "~misfit~" <shaun.at.pukekohe@gmail.com> - 2013-03-17 15:14 +1300
            Re: Laptop battery loses charge when off?? Computer Nerd Kev <not@telling.you.invalid> - 2013-03-17 09:00 +0000
              Re: Laptop battery loses charge when off?? "~misfit~" <shaun.at.pukekohe@gmail.com> - 2013-03-18 01:29 +1300
                Re: Laptop battery loses charge when off?? Computer Nerd Kev <not@telling.you.invalid> - 2013-03-18 05:20 +0000
                Re: Laptop battery loses charge when off?? "~misfit~" <shaun.at.pukekohe@gmail.com> - 2013-03-19 11:39 +1300
                Re: Laptop battery loses charge when off?? "~misfit~" <shaun.at.pukekohe@gmail.com> - 2013-04-11 15:13 +1200
        Re: Laptop battery loses charge when off?? wrat@panix.com (the wharf rat) - 2013-03-19 15:45 +0000

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