Re: battery question - nimh vs hybrid nimh

On Sat, 30 Jun 2007 20:44:15 GMT, Dave Cohen wrote:

And a very poor choice of name at that. Eneloop doesn't exactly convey
much either but at least it seems to be unique (my dictionary doesn't
show it). But what the heck, they work great and I would expect this
type to eventually supersede normal NiMH's, particularly if they can up
the capacity a little.

The probably could, but I'd rather they didn't, as it seems to be
a tradeoff between low self-discharge and high capacity. From the
little I've read about Eneloop type NiMH batteries, they're not
really chemically different than standard NiMH cells. The
difference is due to mechanical construction, such as thicker, less
porous internal membranes that helps slow down unwanted chemical
reactions. I don't approve of some of the techniques used to
increase capacity. One is to slightly increase the diameter of the
NiMH AA cells. This makes them hard to insert and remove in some of
my non-camera devices, but it certainly allows the inclusion of more
NiMH "soup". :)

At first I suspected that the increased diameter might have been
due to stretching due to the heat from many charge cycles. But I
soon found that some brand new NiMH cells were oversized. I've
never found any alkaline battery brands that had abnormally large
diameters.

.

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