Groups > alt.comp.hardware.pc-homebuilt > #43936

Re: How do I find a power adapter spec for an old Hyundai laptop?

From	Paul <nospam@needed.invalid>
Newsgroups	alt.comp.hardware.pc-homebuilt, alt.comp.os.windows-10, sci.electronics.repair
Subject	Re: How do I find a power adapter spec for an old Hyundai laptop?
Date	2025-05-07 21:58 -0400
Organization	A noiseless patient Spider
Message-ID	<vvh33u$1g1d8$1@dont-email.me> (permalink)
References	(5 earlier) <6817ae85$0$22$882e4bbb@reader.netnews.com> <vv8cuv$2k0fq$1@dont-email.me> <vverfe$3td2g$1@paganini.bofh.team> <vvgbi2$16qep$1@dont-email.me> <vvglj2$9lt$1@paganini.bofh.team>

Cross-posted to 3 groups.

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On Wed, 5/7/2025 6:07 PM, Uncle Bob wrote:
> On Wed, 7 May 2025 15:16:17 -0400, Paul wrote:
> 
>> The whole job is not an easy task -- unless the white lettering is
>> still visible on the bottom.
> 
> Thanks for looking at it where you noticed there's NOTHING by way of
> description other than the one brand name on the outside top cover.
> 
> I made a small mistake in the links to the pictures which I fixed below.
> https://i.postimg.cc/rySRMrvs/hyundai-a.jpg
> https://i.postimg.cc/zvJzJVgH/hyundai-b.jpg
> https://i.postimg.cc/KYSyG1Xc/hyundai-c.jpg
> https://i.postimg.cc/RVpSBCVq/hyundai-d.jpg
> https://i.postimg.cc/j27y7YjV/hyundai-e.jpg
> https://i.postimg.cc/4Ng4zRLJ/hyundai-f.jpg
> 
> This is a google search for images of a similar 14-inch Hyundai laptop.
> https://www.google.com/search?tbm=isch&q=hyundai+14+laptop
> 
> Since a search of images isn't finding ANYTHING like it, I'll rip it open
> where I hope to find what the battery charger voltage & amps is inside.
> 
> Thanks for all the advice.
> 

The battery is, if memory serves, 8.4V or two cells in series.
The 8.4V is the fully charged voltage, and 7.4V is closer
to the "nominal" voltage after it settles. Charging it from 12V
makes sense. If a 19V adapter was used, that would be wasteful,
with some amount of heat generated.

Lithium cells have to be charged with a "precision" charger.
The cells have high energy density (which is why we use them),
but they are also fairly unstable and must be treated with respect.
That's why there are videos of laptop fires.

You could use any external voltage you wanted, if there was a
buck converter inside, but I don't think they do the design
that way. Someone in a USENET group, used a "generic" adapter
which had a slightly higher voltage than was required, and
about a month later he wrote back to report the laptop no longer
charged the battery and something had broken. I take this as a
sign that the machines are not tolerant of using the wrong voltage.

   Paul

Thread

How do I find a power adapter spec for an old Hyundai laptop? Umberto <canaliumberto@impresatrecolli.com> - 2025-05-01 13:38 -0500
  Re: How do I find a power adapter spec for an old Hyundai laptop? Paul in Houston TX <Paul@Houston.Texas> - 2025-05-01 20:33 -0500
    Re: How do I find a power adapter spec for an old Hyundai laptop? Randy Jones <randolphJones@randyjones.com> - 2025-05-03 23:17 +0200
      Re: How do I find a power adapter spec for an old Hyundai laptop? Paul in Houston TX <Paul@Houston.Texas> - 2025-05-03 17:04 -0500
        Re: How do I find a power adapter spec for an old Hyundai laptop? Ivano Rossi <Ivano.Rossi@nospam.tin.it> - 2025-05-04 00:43 +0200
          Re: How do I find a power adapter spec for an old Hyundai laptop? Paul <nospam@needed.invalid> - 2025-05-03 21:12 -0400
          Re: How do I find a power adapter spec for an old Hyundai laptop? Paul in Houston TX <Paul@Houston.Texas> - 2025-05-04 00:31 -0500
          Re: How do I find a power adapter spec for an old Hyundai laptop? Mark Lloyd <not.email@all.invalid> - 2025-05-04 18:14 +0000
            Re: How do I find a power adapter spec for an old Hyundai laptop? Paul <nospam@needed.invalid> - 2025-05-04 14:51 -0400
              Re: How do I find a power adapter spec for an old Hyundai laptop? Umberto <canaliumberto@impresatrecolli.com> - 2025-05-07 01:35 -0400
                Re: How do I find a power adapter spec for an old Hyundai laptop? knuttle <keith_nuttle@yahoo.com> - 2025-05-07 07:33 -0400
                Re: How do I find a power adapter spec for an old Hyundai laptop? Paul <nospam@needed.invalid> - 2025-05-07 15:16 -0400
                Re: How do I find a power adapter spec for an old Hyundai laptop? Uncle Bob <uncle.bob@nospam.net> - 2025-05-07 18:07 -0400
                Re: How do I find a power adapter spec for an old Hyundai laptop? knuttle <keith_nuttle@yahoo.com> - 2025-05-07 19:55 -0400
                Re: How do I find a power adapter spec for an old Hyundai laptop? david <this@is.invalid> - 2025-05-08 05:27 -0600
                Re: How do I find a power adapter spec for an old Hyundai laptop? Paul <nospam@needed.invalid> - 2025-05-07 21:58 -0400
                Re: How do I find a power adapter spec for an old Hyundai laptop? Larry Wolff <larrywolff@larrywolff.net> - 2025-05-08 07:21 -0400
                Re: How do I find a power adapter spec for an old Hyundai laptop? Paul <nospam@needed.invalid> - 2025-05-08 09:08 -0400
                Re: How do I find a power adapter spec for an old Hyundai laptop? Theo <theom+news@chiark.greenend.org.uk> - 2025-05-08 11:06 +0100
                Re: How do I find a power adapter spec for an old Hyundai laptop? Peter <confused@nospam.net> - 2025-05-08 12:15 +0100
                Re: How do I find a power adapter spec for an old Hyundai laptop? Theo <theom+news@chiark.greenend.org.uk> - 2025-05-08 12:42 +0100
                Re: How do I find a power adapter spec for an old Hyundai laptop? Paul <nospam@needed.invalid> - 2025-05-08 09:18 -0400
                Re: How do I find a power adapter spec for an old Hyundai laptop? Paul in Houston TX <Paul@Houston.Texas> - 2025-05-07 22:08 -0500
                Re: How do I find a power adapter spec for an old Hyundai laptop? micky <NONONOmisc07@fmguy.com> - 2025-05-08 01:13 -0400
                Re: How do I find a power adapter spec for an old Hyundai laptop? Paul <nospam@needed.invalid> - 2025-05-08 08:28 -0400
          Re: How do I find a power adapter spec for an old Hyundai laptop? micky <NONONOmisc07@fmguy.com> - 2025-05-08 01:10 -0400
            Re: How do I find a power adapter spec for an old Hyundai laptop? Paul <nospam@needed.invalid> - 2025-05-08 09:42 -0400
              Re: How do I find a power adapter spec for an old Hyundai laptop? Theo <theom+news@chiark.greenend.org.uk> - 2025-05-11 08:33 +0100
  Re: How do I find a power adapter spec for an old Hyundai laptop? Paul <nospam@needed.invalid> - 2025-05-01 21:37 -0400
    Re: How do I find a power adapter spec for an old Hyundai laptop? Frank Slootweg <this@ddress.is.invalid> - 2025-05-03 12:33 +0000
  Re: How do I find a power adapter spec for an old Hyundai laptop? "...winston" <winstonmvp@gmail.com> - 2025-05-01 23:52 -0400
  Re: How do I find a power adapter spec for an old Hyundai laptop? micky <NONONOmisc07@fmguy.com> - 2025-05-02 01:56 -0400
    Re: How do I find a power adapter spec for an old Hyundai laptop? Paul <nospam@needed.invalid> - 2025-05-02 13:57 -0400

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