Subject:
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Re: Batteries?
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Newsgroups:
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lugnet.robotics
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Date:
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Tue, 1 Dec 1998 22:36:00 GMT
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Original-From:
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Daniel Miller <DANIELMI@EXPERT.CC.nomorespamPURDUE.EDU>
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Viewed:
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2899 times
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On Tue, 1 Dec 1998, Gary Hughes wrote:
> re: rechargeables
>
> ...And they have a 'memory' so
> you do want to run them down periodically. They are not recommended
> for the PalmPilot for the same reason.
NiCad "memory" is a myth. Long ago, nicads were much more sensetive to
how they were charged, but their performance is a function of how they got
the charge they're on, not on previous charges. Modern cells are far
less sensetive than they were 10 years ago. Here's a hint though... pass
up "trendy" nicads in flowery packaging and get those good ol' yellow
Sanyo cells that are often sold loose.
NiCads have a much lower capacity than alkies. Their advantage is that
nicads, due to lower internal resistance, can dump out a lot faster- this
is the main reason they're used in R/C cars.
I suspect the best reason not to use nicads in the RCX is that they have
lower voltage... 6 will have 7.2 V instead of 9, which is closer to the
brick's specified range. An 8-pack ought to work fine, but you'd have to
mount it externally.
Daniel "Dan'l" Miller Senior, School of Aeronautics and
danielmi@expert.cc.purdue.edu Astronautics, Purdue, Indiana
danielmi@cartoon.ecn.purdue.edu
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Message is in Reply To:
 | | Re: Batteries?
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| re: rechargeables (...) That is the problem with NiCd rechargeables. By the time the battery low detector kicks in, it is often too late. And they have a 'memory' so you do want to run them down periodically. They are not recommended for the (...) (26 years ago, 1-Dec-98, to lugnet.robotics)
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