crest logo banner adsolstice ad
site map
Main    Discussion Archives register comment
home
energy and environment
discussion groups
calendar
repp
gem
about us
employment
discussion groups
efficiency efficiency miropower micropower solar solar wind wind geothermal geo bioenergy bioenergy hydro hydro
Ev Archive for May 2001
1845 messages, last added Wed Aug 08 18:52:09 2001

[Date Index][Thread Index]

Re: Need quick response, please




----- Original Message -----
From: "David Schwarze" <sde@home.com>
To: <ev@listproc.sjsu.edu>
Sent: Thursday, May 31, 2001 12:49 PM
Subject: Re: Need quick response, please


> At 02:40 PM 5/31/2001, you wrote:
> >Thanks for quick reply,
> >
> >Sure, I realize that. I should have been more clear - I'd give each
> >battery about identical time under load, say 5-10 seconds and
> >capture readout whatever it is (while voltage slowly keep falling).
> >
> >The key is to make conditions identical, I'm interested only
> >in differences. So is the method above any more beneficial
> >vs just OCV reading?
>
> I don't think it's worth your trouble.  A .5 amp load for a few seconds on
> that size of battery is not going to tell you much.  Given that all of the
> batteries have been charged about equally and been sitting about the same
> length of time, I'd base my decision on equal no-load voltage and be
pretty
> confident in it.
>
> -David

Hi Victor and others,
    I would agree with the highest equal no-load voltage method. That is the
way I shopped for a couple of battery cores to experiment with. I knew that
the batteries had been sitting for a specific period of time, so I selected
(in my case) the newest, cleanest looking batteries and tested them first. I
found two that were within a couple hundreds of a volt of each other, and
these also had a hydrometer eye that indicated that they were "okay", at
least on the one cell that the eye was submerged in. So far, so good. They
are fine for the light use they have been given.

    Rick