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Article #471

... How to make a charger ...

#471
From: Seetamraju UdayaBhaskar Sarma
Date: Mon, 25 Jan 1993 01:04
40 lines
2078 bytes
I have 2 laptop batteries (and only 1 laptop ;-((  )

The batteries cant be charged without placing them into the laptop and
pluggin'-in the charger ::: i.e., the company does not manufacture
a separate battery charger like the ones we are used to, for AA, AAA
and D- size cells.

To make things worse, each battery takes 5 to 6 Hrs to charge up.  That will
mean I have to wake up @ 3:00 AM to switch batteries, so that I have 2
fully charged batteries for working on my thesis in the library from
10:00 AM to 9:00 PM (Intermittenly, typing something into the laptop).

I have seen a lot of people discuss this on comp.sys.laptops much earlier...

I bought a 6V 400mA ORDINARY AC adapter, and would like to use it to
charge one of the batteries, while the other charges within the laptop.

((I am a student, and dont have money to have this made by somebody else.))

The 24cm long battery of my laptop has the ratings : 4.8V 5000mA/h

I know what 5000mA/h means, and I also know that continual charging of a
NICD battery only makes it hot.   So, should I hook the AC adapter to the
battery (The extra bettery cost me $100 :-(( )  and hope everything
works out well ?

What are the problems of using a 6V AC Adapter to charge a 4.8 V NICD battery?

And how do I POSSIBLY detect ``the end of charging'' using a multimeter, with
the multimeter connected in series in the charging circuitry.

Please answer whatever U can confidently answer about...

email or usenet repleis are equally good....

thanx a lot....

Seetamraju Udaya Bhaskar Sarma
(email : seetam @ ece7 . eng . wayne . edu)
Technical Details
Message-ID: <1993Jan25.010417.5861@cs.wayne.edu>
Path: arc1-ca.pugleaf.net!sparky!uunet!gatech!destroyer!wsu-cs!nova!seeta

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Newsgroups: sci.engr,comp.sys.laptops
Path: arc1-ca.pugleaf.net!sparky!uunet!gatech!destroyer!wsu-cs!nova!seeta
From: seeta@eng.wayne.edu (Seetamraju UdayaBhaskar Sarma)
Subject: ... How to make a charger ...
Message-ID: <1993Jan25.010417.5861@cs.wayne.edu>
Sender: usenet@cs.wayne.edu (Usenet News)
Reply-To: seeta@eng.wayne.edu
Organization: College of Engineering, Wayne State University, Detroit Michigan, USA
Date: Mon, 25 Jan 1993 01:04:17 GMT
Lines: 40