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On Dec 11, 8:12*pm, John Doe <j...@usenetlove.invalid> wrote:
> I'm discharging a nickel metal hydride (NiMH) AA battery at 500
> milliamps. After the first minute or so it shows 1.05 V. Between then
> and three hours later, the voltage steadily rises to 1.08 V. Is there
> something wrong with the battery analyzer, or can battery voltage
> increase very slightly as the battery discharges?
>
> Or maybe I'm reading the analyzer voltage that produces the 500
> milliamps through the battery? And that's the voltage required to
> produce the 500 milliamps? As expected, several other batteries show
> the voltage levels decreasing as they discharge, but this one is
> consistently unusual.
>
> I'm using the Maha PowerEx MH-C9000 battery charger/analyzer.
>
> Thanks.

Between the first minute and three hours later did you leave it open
circuit ? then the voltage can go up slightly, and it is normal.

M. Moorthi
www.battery-consulting.com

MuMu <> wrote:

....

> Between the first minute and three hours later did you leave it
> open circuit ?

Absolutely positively not. It's consistently discharging at 500
milliamps the entire time. After doing another "Break-In and
Analysis" and again discharging but with the two batteries in
opposite battery charger/analyzer slots, the weird battery starts at
about .96 V and slowly rises, hours later to about 1.10 or 1.15
before it starts falling and finishes discharging.

On Fri, 12 Dec 2008 06:09:53 -0800 (PST), Martin Brown
<|||newspam|||@nezumi.demon.co.uk> wrote:
>But there is something odd happens with matched sets of NiMH batteries
>in some digicam applications. I have several sets for a Pentax istD
>digicam. What I have noticed is that one cell always appears weaker
>than all the others by a significant margin and the camera fails early
>with "low battery" when NiMH cells are used ending up with 3 good ones
>and one flat. The first one to go flat kills it. The odd thing is that
>I suspect the flat is almost always in the same battery slot - as if
>there is some extra burden on that specific cell. Using flash heavily
>or excessive cold generally tips it over the edge more quickly.
>
>I have taken to putting dots on the failing cells but there is no
>obvious pattern - it isn't same cell failing every time due to higher
>self discharge or internal factors. I have noted the position where
>the cell most likely to fail resides and swap it out on failure. This
>usually works and has better odds than perm 4 from 8 with 2 duds.
>
>More curious still single use Duracells with higher terminal voltage
>which I use when the NiMH have all died always seem to discharge
>evenly. I would be interested if anyone can explain this.
>
>Regards,
>Martin Brown

I wonder what would happen if you put an alkaline in that slot, along
with rechargables in other slots? The evil slot probably is powering
something else as well.

Regards,
Bob Monsen