Re: NiMH cell charging

On Tue, 17 Jun 2008 18:34:43 -0700 (PDT), Engineer
<junk2007@xxxxxxxxxx> 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
.

Relevant Pages

  • Re: A610 battery life?
    ... > currently has no NiMH batteries or charger, and if he did buy them they ... > When all of those are true, then there's no point acquiring NiMH ... > cameras is essentially zero. ...
    (rec.photo.digital)
  • Re: Will external battery pack work with a Canon A300?
    ... about twice the life of the NiMH AA cells, ... NiMH AA cells normally last about twice as long as AA ... cameras, they can last more than 5 times longer. ... NiCad batteries have always had particularly low capacities. ...
    (rec.photo.digital)
  • Re: A dSLRs fastest shutter-speed is really no faster than its flash-sync speed.
    ... if F cells would be used instead of AA cells. ... I made a JOKE about batteries in hybrid cars, ... people who don't use their cameras much (my "accident camera" in the ... out, the NiMH proponents repeatedly misrepresent the facts, and I don't ...
    (rec.photo.digital)
  • Re: Dpreview selector: AA batteries?
    ... Unless LiIon can supply more current than NiMH, ... especially when compared with cameras that only use 2 AA ... NiMH cells. ... But lithium batteries ...
    (rec.photo.digital)
  • Re: lighting battery - what I have now done :-)
    ... >> I hate the idea of buying NiCds because of the environmental ... >> charger, so I am inclined towards Cyclon cells for one last attempt ... a/h of NiMH is comparable in price, ...
    (uk.rec.cycling)