Date: Mon, 19 Feb 2001 22:19:31 -0000
From: "Matthew Hanson" <[EMAIL PROTECTED]>
Subject: Re: 50CT & 70CT batteries
>From: "Pres Waterman" <[EMAIL PROTECTED]>
>Date: Mon, 19 Feb 2001 10:55:18 -0500
>It has to do with capacity versus drain rate. The "standard" ( smaller )
>battery for the L50 is 1200 maH. The "extended" is 2400 maH. That means
>roughly that you could take 1.2A out of it for an hour. But actually that
>rating is usually given at a slower rate. 1200maH is perhaps better
>described as 400ma/3H
>
>Do you see where I'm going? If the load draws 1200mA you will get slightly
>less than an hour off a 1200maH battery but maybe well over 2H from a
>2400maH battery because the outflow is a lower proportion of its capacity.
>
>This is borne out in practice with my wife's L50 and also my old L50J. The
>standard battery was under an hour. The extended battery with twice the
>rated capacity was over 3 hours, so 2x battery gives 3.5x gain! Something
>for nothing, almost.
I get the jist of this... but I'm not clear on the details. Logically if
the larger capacity battery is twice the maH rating, it should only last
twice as long. But somehow because of the chemistry and electronics, the
smaller battery ends up lasting less than its rtated capacity, and the
larger one longer, huh?
>Another factor is that as the Libretto series became more modern the
>current drain of the newer, faster but lower voltage CPUs became
>less.Therefore greater life for the same battery when a 70 or 100 is
>compared to the 50.
This is something I was guessing might be the case too.
>Ohm's Law should dictate that lower voltage devices will draw more current,
>thus equalizing the power drain. But the "lower voltage" concept in this
>case refers more to the internal spacing of the junctions which require
>less power to operate.
Okay... that makes sense. So is it still possible that a brand new Li-Ion
battery for the 50CT may be more efficient than the old one that came with
it when it was new? That maybe the old 50CT may last longer on the new
battery than the old one when it was new?
Matt
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