[ltp] self-made external battery for laptops project

[James Holden]

Tried this some time ago when I didn't have the correct PSU for my 2nd hand 
thinkpad....

12V got it booted, but it wasn't too stable. If you accessed the CD-ROM, which 
of course spins up and draws more current, the machine would switch off.

You may get different results though with a different PSU, it depends how well 
regulated it was.

You could always build yourself a DC-DC converter with some big 
electrolytics....

James


Quoting Bart-Jan Vrielink <bartjan@vrielink.net>:

> On Fri, 2002-04-19 at 04:41, peter nol wrote:
> 
> > Hi all i recently got an IBM 600 thinkpad at an auction with a dead
> battery.
> > The price for severall cells and a chip sealed in plastic called "a custom
> 
> > laptop battery" is ridiculous, so i decided to make my own.
> > Googling got me to this page 
> > where it is described how to make an external battery from a 12v camcorder
> 
> > battery sold in radioshack for $40
> > And "fool" the laptop to think that it's a 
> > http://www.fixup.net/tips/battery/battery.htm
> > 
> > I am also looking into the idea of using a small motorcicle 12v battery.
> > I will probably use the AC plug in the laptop.
> 
> I would also use the AC plug, because I don't know how the laptop will
> react to a battery without a charge indicator.
> 
> > Looking for advice/opinion.
> > Does the thinkpad require 16 volts for the plug to operate or 
> > is 12 volts adequate and you just have to trick it into starting to use the
> 
> > 12 volts- like with the libretto?
> 
> I don't know the exact voltage range the 600 will work on, but I have
> used my 600 with an Olivetti 18V power supply for months and now use a
> Toshiba (Tecra 8000) power supply that has a 15 V output.
> This is enough to charge my battery. I do not know if 12 V is enough to
> boot the laptop.
> 
> -- 
> Tot ziens,
> 
> Bart-Jan
> 
> 
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-- 
James Holden, Leeds, United Kingdom
james-at-microcosmos.co.uk
In a world without boundaries, who needs Gates?

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