Subject:
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Re: Charging batteries
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Newsgroups:
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lugnet.robotics
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Date:
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Wed, 21 Oct 1998 11:45:56 GMT
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Viewed:
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5294 times
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Panasonic sells quick-charge high capacity (1100maH) NiCads pretty
cheaply. I believe I bought the charger with 4 batteries for less than $20
at Costco, and have bought a few 6packs of AA for less than $15 each
($9-12?) also at Costco.
I got them for my digicam, they last a LOT longer than the other standard
550-650maH NiCads I was using.
Rob Trainer wrote:
>
> Radio Shack has a quick charger that does AA and AAA NiMH batteries, I think
> it was about $25.00. The AAA cells I bought were $10.00/pr.
>
> Rob Trainer
> btrainer@home.com
> rtrainer@csti-md.com
>
> Alex Wetmore wrote in message <908291583.842286@phred>...
> > Eric Brok wrote in message ...
> > > Our institution (a school) considers to purchase two Mindstorms sets for
> > > students to work with. I'm looking for the best way to deal with batteries
> > > in such a setting. I have seen some posts mentioning some concerns, but
> > > would like to have some more advice, like:
> > > - are NiCad the best and/or only rechhargable batteries
> >
> > NiMH is also an option. They are coming down the prices of NiCad (about
> > $5/cell right now). The average NiMH AA cell has a greater capacity then
> > the average NiCad cell (1300mah vs about 850mah).
> >
> > > - are quick-chargers better or worse; depending on what?
> >
> > Quick chargers which make some effort to sense the state of the battery are
> > much better then slow dumb chargers or timed quick chargers. Its hard to
> > find these in AA size though. The only one that I know of is my by Olympus
> > for digital cameras. http://www.necx.com sells it (under digital camera
> > accessories). Its about $50 including 4 AA batteries, so you'd need 3 of
> > them for two Mindstorms robots. It charges 4 batteries in about 2 hours.
> > It monitors both cell temp and voltage to determine when to stop charging
> > the cells. This makes the cells last much longer, because they never
> > overheat.
> >
> > > - do NiCads have a 'memory effect'?
> >
> >
> > Memory effect is for the most part a myth. 99% of the damaged NiCad cells
> > out there were damaged by overcharging them and causing them to overheat.
> > For more information on this subject check out the article on battery
> > technology at http://www.sheldonbrown.com/harris (its in the set of • articles
> > about bicycle lighting). This is a bicycle oriented site, but the article
> > is short and good reading.
> >
> > alex
> >
> >
--
Tom Stangl
***http://www.vfaq.com/
***DSM Visual FAQ home
***http://ba.dsm.org/
***SF Bay Area DSMs
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Message is in Reply To:
 | | Re: Charging batteries
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| Radio Shack has a quick charger that does AA and AAA NiMH batteries, I think it was about $25.00. The AAA cells I bought were $10.00/pr. Rob Trainer btrainer@home.com rtrainer@csti-md.com Alex Wetmore wrote in message <908291583.842286@phred>... (...) (28 years ago, 13-Oct-98, to lugnet.robotics)
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