On Tue, 17 Jun 2008 18:34:43 -0700 (PDT), Engineer
wrote:

Perhaps some of the experts here could address this - I am not a
battery expert!
We have two digital cameras, both Canons - an A75 and an SX100IS.
They gobble up AA MiMH cells, particularly the SX100IS which uses only
two. I have one NiMH charger and one old NiCAD charger.
I also have a variety of NiMH cells, from green "no name" ones to
state-of-the-art Sanyo "eneloop" types, with some other brands in
between.
Some questions:
Can I charge the NiMH cells in the NiCAD charger? I think this
charges them more slowly as they don't get as hot as in the NiMH
charger.
Could I even leave them in the NiCAD charger to stay fresh? Not so
sure about this as it does not shut off (old analog design) - but I
could regulate the input AC voltage to turn it into a trickle charger
(but NiMH's might not like that, either.)
So, all comments or suggestions elcomed... also any other other
proven, established NiMH lore or sources!
Thanks for all replies
Cheers,
Roger

Charger: if it is an old C/10 charger - no problem.
(I am doing it for years now, occasionally forgetting to take the
cells out etc. Very bad procedure, but does not seem to hurt cells
much)

If it is a fast charger - don't! delta V is different.

Most batteries fail in cameras due to Ri being too high, not due to
lack of capacity. Failing batteries may work well in e.g. a radio, but
not in the camera.

I seem to observe that *lower* capacity batteries perform *better*
with respect to Ri and lifecycle.

--
- René