Date: Mon, 19 Feb 2001 10:55:18 -0500
From: "Pres Waterman" <[EMAIL PROTECTED]>
Subject: Re: 50CT & 70CT batteries
> I still am baffled as to how I'm getting 2.5 hours of life out of this
> bigger battery that came with the L70, and I've hardly ever been able to
get
> a hour out of the original L50 battery, even when it was running W95.
Guess
> I'll get a new standard Li-Ion battery for the L70 to make it as compact
as
> I like, and then try it out in the old L50 for comparison.
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.
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.
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.
Thanks
Pres Waterman W2PW
c/o Patchogue Motors, Inc.
Long Island Ford and Kia dealer
GO BILLS!
**************************************************************
http://libretto.basiclink.com - Libretto mailing list
http://libretto.basiclink.com/archive - Archives
http://www.picante.com/~gtaylor/portable/faq.html - FAQ
-------UNSUBSCRIBE-------
mailto:[EMAIL PROTECTED]?subject=cmd:unsubscribe
--------UNSUBSCRIBE DIGEST------
Use above but add DIGEST to the subject line...
**************************************************************
