Yes, on a good many of them. Mostly names/brands that are second-tier:
Powerex, retailer house brands, etc.

Duracell high cap. (2650 mAh) capable of 15 minute full charge seem to
be the best, with at most a 10% non-recoverable degradation. Most others
seem to average 50%, but that's just from memory (no adjustment made for
my own memory-effect ;)

The Duracells appear to not take a full charge occasionally, based on
their level after storage, and indeed the capacity is much lower if just
charged at that point, but if cycled on a conditioner, they come back
up. Most others aren't so lucky.

I just started getting Eneloops, but have no data yet. I've been
impressed enough with the Duracell rapid charge ones that I use them in
all my digital cameras (the bigger SLR types). Shelf life is pretty good
too, so they're always ready to go at good capacity, and/or quickly made
ready. None others qualify...=20

If put on the 15 minute charger (fan cooled), they do only take 15
minutes or less. That works out to be >10A rate. They get very warm, but
other brands make nice fireworks at that rate. Good low internal
resistance. IIRC, among what I've used over the years, there is a
correlation between apparent low internal resistance (indicated by
taking higher charge rates at cooler temps) and longer term ability to
maintain rated capacity.=20

-Skip


On Wed, 2011-01-19 at 05:05 +1300, RussellMc wrote:=20
> Question:
>=20
>  "Calendar life degradation" =3D loss of capacity with time, regardless
> of amount of use, with capacity not being restored by subsequent
> charge-discharge cycles - is rare in NimH batteries. Has anyone seen
> this occur to a significant extent in any NimH cells?
>=20
>=20
>         Russell

--=20
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