Subject:
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Re: Rechargeable Batteries
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Newsgroups:
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lugnet.robotics.rcx
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Date:
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Sat, 4 Aug 2001 18:38:09 GMT
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Viewed:
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1399 times
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Dave Baum <dbaum@spambgoneenteract.com> writes:
>
> Nicads have a lower cell voltage (1.2 rather than 1.5), so they won't
> work very well in the RCX.
I use NiMH and get a voltage between 7.8V freshly charged and 7V
at the low end (i.e. slightly higher than NiCd). The lower voltage
is not really a problem for me. The motors may be somewhat less
powerful, but if you're just playing and not taking part in
a competition that's ok IMHO.
> Personally I use rechargeable alkaline cells (e.g. Ray-o-vac Renewal
> batteries). The downside to rechargeable alkalines are that they don't
> have great capacity - you'll find yourself recharging them rather
> frequently. On the plus side: they have great shelf life, are cheap,
> easy to find, and don't have any memory effect.
I had bad experiences with a german variety of rechargeable alkalines
(Mueller) in my Palm III, they died after very few charge cycles, and
they were expensive. I don't know the Rayovacs though.
> I just have an extra
> set on hand, and make it a habit to swap sets after an evening of
> building. That way the RCX always has fresh power.
For the NiMHs I recharge when empty and have a full set handy.
> I haven't tried NiMH cells, but I don't know of any reason why they
> wouldn't work. One potential down-side to NiMH is that they have very
> short shelf life (they lose their charge quite rapidly even if not in
> use). So if you put your RCX aside for a couple of weeks its very
> likely that the NiMH cells will have lost their charge during that time.
No, up to at least three months that is not a problem in my experience.
Jürgen
--
Jürgen Stuber <stuber@loria.fr>
http://www.loria.fr/~stuber/
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Message is in Reply To:
 | | Re: Rechargeable Batteries
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| (...) Nicads have a lower cell voltage (1.2 rather than 1.5), so they won't work very well in the RCX. Personally I use rechargeable alkaline cells (e.g. Ray-o-vac Renewal batteries). The downside to rechargeable alkalines are that they don't have (...) (23 years ago, 3-Aug-01, to lugnet.robotics.rcx)
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