Bob Blick wrote:

> On Tue, 9 Jun 1998, Dennis Plunkett wrote:
> >
> > I don't agree with the 75% of capacity, we get 100 to 115% consistntly, note
> > that the capacity tests are done with a light load! Not a huge 1AMP  or
> > something like that. 0.8V is quite OK for most things, also note the
> > internal impedance of the cell at this voltage.
>
> Maybe it's a conversion problem from American to Australian amp-hours :-)
> Seriously, though. The specs published by Duracell are the optimum. It is
> almost impossible to get what they claim. The original post was from
> someone with a 300mA requirement. I had previously done tests of Duracell
> D-cells at that exact load, with temperature varying between 50 and 70
> degrees F. I got a fraction over 12 amp hours. The cells are rated 15 amp
> hours by Duracell. I think I gave a valid answer to his exact question,
> and to the majority of users.

You are right. The 'capacity' quoted by manufacturers are the integralof the current over time for a
really 'light' load. When you slap on your
current guzzlers, you get to experience the rise in internal resistance,
temperature effects and other mysterious properties that make your
life a misery.

This is why you have to check for a discharge curve at the load you
want to work with.

A very important thing about batteries : *NEVER* believe the reps.
Check it out for yourself. We've seen really cheap no-name NiCd
batteries outperform (and outlast) all the NiCd brand makes. I've
heard such crap comming from these reps that I went the mile and
made a bit of a study. It is really worth it.

Three weeks ago one of these a**holes told me that the Hawker
batteries aren't very good because they don't do well in temp extremes.
Bull!! They are the *only* batteries to still work (and charge) well
from -20DC to +80DC.

So, bottom line, do your homework. Study all the types, and then
choose a Hawker Pb gel. ;) I think there is a link on my home page
to Hawker.

--
Friendly Regards

Tjaart van der Walt
mailto:tjaart@wasp.co.za

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