naturerecordists
[Top] [All Lists]

Re: Nicad charging.

Subject: Re: Nicad charging.
From: Walter Knapp <>
Date: Sun, 10 Nov 2002 02:33:36 -0500
Jeremiah Moore wrote:
> It is as I suspected.  I'd been thinking: if they can change the 
> chemistry such as to increase the capacity, it might be possible to 
> change the chemistry in another way to increase the voltage, making 
> the batteries more compatible.

Voltage is very fundamental to the chemistry. Capacity is more a 
function of surface area of the plates and such like, that can be changed.

> I think it's a problem with this particular model - it draws a lot of 
> current when writing to the disc, and this can pull the voltage down 
> slightly.  The shutoff is I believe tailored to NiCDs, whose sharp 
> dropoff below a certain threshold might endanger the recording if the 
> device lost power before it could write a TOC.

The NIMH will hold both voltage and current way higher than Nicads. 
Their dropoff occurs at about 80% of the charge used up. And they hold 
quite a bit more charge than Nicads. If it would run with Nicads, it 
should run better with NIMH.

> I agree that manufacturers should design for NiMH batteries.

Yes, this is the way it should happen to make things more compatible.

Walt





________________________________________________________________________
________________________________________________________________________



Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/ 


<Prev in Thread] Current Thread [Next in Thread>
Admin

The University of NSW School of Computer and Engineering takes no responsibility for the contents of this archive. It is purely a compilation of material sent by many people to the naturerecordists mailing list. It has not been checked for accuracy nor its content verified in any way. If you wish to get material removed from the archive or have other queries about the archive e-mail Andrew Taylor at this address: andrewt@cse.unsw.EDU.AU