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 20:24:37 GMT
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Viewed:
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2360 times
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moz wrote:
> L. M. Lloyd <lee@advfilms.com> wrote
> > > - do NiCads have a 'memory effect'?
> > Yes! Nickle Metal and Lithium Ion bataries do not.
>
> OK, I've done a web search on this, and the consensus seems to be "not on
> this planet". The conditions for the original study were on a satellite,
> with absolutely regular charge/discharge cycles, no gravity and no
> acceleration. The effect was resolved by 4 deep cycles. I think the
> article was at: http://www.vencon.com/articles/nicd2.html, but I may be
> wrong.
>
> The other consensus is that the easiest way to wreck nicads is to
> overcharge them. You must switch to C/40 or so after charging to between
> 1.4 and 1.6 C, otherwise you will cause non-repairable damage. The
> easiest way to do this is IMO a timer switch. Set it for 15 hours and go
> home for the day.
>
> Note that nickel metal hydride and lithium ion hydride batteries are also
> vulnerable to overcharging, and especially to overheating. So if you
> currently kill nicads regularly NimH may just increase the costs... It
> would possibly pay to buy one of the more expensive chargers that do this
> automatically.
>
> HTH
> Moz
Well I will be the first to admit that this is hardly a scientific study but
here is my personal experience. For 4 years I have had the same cellular
phone and the same notebook computer. The cellular phone is a Motorola with
an Intelecharger (first 2hrs quick charge rest of the time trickle charge)
using the exact same charging methods. The 2 NiCads that came with the phone
lasted 6mo-1yr before they would run out of power within 1hr (if you went to
the extra effort of repeatedly turning the phone back on to completely drain
the battery you could get it's live time up to 3 hr for another mo). The NiMH
replacement I purchased has lasted 3.5 yrs and still gives me 12hrs standby
time. The Lithium Ion has not dropped its standby time at all in the 1.5yrs I
have owned it. The notebook I do not think has as good a charging system
because it wrecks NiCad even faster but has left my Lithium Ion unharmed. So
You might possibly have some specific (and quite possibly more correct)
definition of "Memory Effect" than what I am using. But in my personal
experience NiCad is so much more susceptible to charging damage than the
other two that if it is not the dreaded memory effect, then we need to come
up with a new name for whatever is wrong with them.
--
__________________
L. M. Lloyd
lee@advfilms.com
SGI Animator
ADV Films USA
__________________
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Message is in Reply To:
 | | Re: Charging batteries
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| L. M. Lloyd <lee@advfilms.com> wrote (...) OK, I've done a web search on this, and the consensus seems to be "not on this planet". The conditions for the original study were on a satellite, with absolutely regular charge/discharge cycles, no gravity (...) (26 years ago, 20-Oct-98, to lugnet.robotics)
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