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 23:34:56 GMT
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Original-From:
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Tony Firshman <TONY@FIRSHMAN.DEMON.COstopspammers.UK>
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Viewed:
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8593 times
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In article <3.0.3.32.19981201165554.009b8840@mail.tardis.com>, Gary
Hughes <ghughes@tardis.com> writes
> re: rechargeables
>
> > (Speculating.) It may be that the low-battery indicator does not work
> > with rechargables because of the voltage knee. Typically with
> > rechargables the voltage drops precipitously once you run out of
> > charge. Lego's concern may be that you'll lose your firmware and
> > programs too easily. In a situation like that, it's better to
> > categorically warn people not to use them, than to qualify the warning
> > with "unless you don't give a fig if you lose your firmware and
> > programming".
>
> 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 PalmPilot for the same reason.
>
> Now, I THOUGHT NiMH was not supposed to suffer from these
> problems but I haven't verified this. Some folks claim to have had
> good results with NiMH batteries in the PalmPilot.
Indeed yes - NiMh are much better. The main problem with them is that
they have a high internal leakage. They are much worse than NiCads in
this respect. So much so that the electric car racers here have
abandoned them - they lose too much charge even overnight for their
extreme requirements.
>
> There are also rechargeable alkalines which give you a small number
> of recharges on an otherwise normal alkaline cell.
Yes - they would be a better bet, and give full 1.5v rather than 1.2v
for both Nicad and NiMh.
Mind you a small sealed lead acid battery would be good ballast wouldn't
it (8-)#
--
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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 (...) (28 years ago, 1-Dec-98, to lugnet.robotics)
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