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 21:55:54 GMT
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Original-From:
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Gary Hughes <ghughes@tardis^nomorespam^.com>
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Viewed:
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2721 times
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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.
There are also rechargeable alkalines which give you a small number
of recharges on an otherwise normal alkaline cell.
gary
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Gary Hughes ghughes@tardis.com
Stargate Video Systems Multimedia and Network Consulting
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Message has 4 Replies:
 | | Re: Batteries?
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| (...) 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 (...) (26 years ago, 1-Dec-98, to lugnet.robotics)
| | | RE: Batteries?
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| (...) The Mindstorms documentation mentions somewhere that use of rechargable batteries is possible, but with reduced power. The later part probably refers to the lower cell voltage, as mentioned in another message: (...) (26 years ago, 1-Dec-98, to lugnet.robotics)
| | | Re: Batteries?
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| In article <3.0.3.32.1998120116...rdis.com>, Gary Hughes <ghughes@tardis.com> writes (...) 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 (...) (26 years ago, 1-Dec-98, to lugnet.robotics)
| | | Re: Batteries?
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| (...) Most everything that I've read on this subject argues that NiCad memory is mainly a myth. NiCads do get damaged by overcharging or deep discharging, but except in very controlled situations they don't have a "memory". I recommend reading (URL) (...) (26 years ago, 2-Dec-98, to lugnet.robotics)
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Message is in Reply To:
| | Re: Batteries?
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| (...) I have, with no problems so far - although I recall from the manuals that they're not recommended. The output voltage is lower than you'd get with standard batteries - but the savings are substantial! Cheers, Dominic. -- Dominic Hawken tel: (...) (26 years ago, 1-Dec-98, to lugnet.robotics)
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