Opladning af batterier

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Jeg fik et link til den her "hjælp" fra TDC, men mener slet ikke det er
rigtigt - hvad siger I ?

http://netnyt.tdconline.dk/publish.php?id12%333&email=michael%40schroeder%2edk&customernumber=&a%5fnumber =

Altså hvis de mener NiCd er det rigtigt at lade det køre tør engang imellem,
men Li-Ion mener jeg holder længst ved hele tiden at blive ladet op...

mvh Michael



Re: Opladning af batterier
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http://netnyt.tdconline.dk/publish.php?id12%333&email=michael%40schroeder%2edk&customernumber=&a%5fnumber =
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Hej Michael

Der er ikke nogen klokkeklar konklusion om det.

Der er delte meninger om "memory"-effekten i NiCd-akkumulatorer eksisterer:

"memory"-effekten er en myte:

James A. Zaun: NiCd Batteries do NOT have "memory":
http://www.repairfaq.org/ELE/F_NiCd_Memory.html

"memory"-effekt eksisterer:

Isidor Buchmann: Memory: Myth or fact?:
http://erfred.free.fr/accus/theorie/NA_Memory1.pdf

2.9) Does the memory effect exist?:
http://www.repairfaq.org/ELE/F_NiCd_Battery.html#NICDBATTERY_014

Nyere adresser er måske her:
http://da.wikipedia.org/wiki/Akkumulator_%28elektrisk%29

-

For NiMH er der måske følgende forklaring. Det kan skyldes generelt
faldende kapacitet efter 300 ladningscykler (altså *permanent*
"memory-effekt"):

Choosing a battery that will last:
http://www.buchmann.ca/Article9-Page1.asp
http://www.buchmann.ca/article9-page2.asp
"...
Figure 4 examines the NiMH, a battery that offers high energy density at
low cost. We observe good performance at first but past the 300-cycle
mark, the performance starts to drift downwards rapidly. One can observe
the swift increase in internal resistance and self-discharge after cycle
count 700.
..."
http://www.buchmann.ca/Article9-page4.asp
"...
How much battery maintenance is needed?
The NiMH and NiCd are considered high maintenance batteries that require
regular discharge cycles to prevent memory. Although the NiMH was
originally advertised as memory-free, both NiCd and NiMH are affected
similarly by memory.
..."

-

Teknikken med DC overlejret med AC hedder "reflekslader", "Negative
Pulse Charge" eller "Burp" Charging:

Negative Pulse Charge, or "Burp" Charging: Fact or Fiction?:
http://www.rcbatteryclinic.com/burp.html
Hovedadresse:
http://www.rcbatteryclinic.com /

-

FAQ om genopladelige batterier
http://www.photo-gallery.dk/side-08.htm
Citat: "...
I langt de fleste tilfælde holder mobilens batteri i et par år og derover
...
[Dette er måske en myte:]
genopladelige celler aflader nemlig sig selv, hvis de ligger ubrugt, og
de har bedst af at blive motioneret med jævne mellemrum, ellers bliver
de "dovne".
..."

http://www.photo-gallery.dk/oversigt/default.htm

R/C Battery Clinic:
http://www.rcbatteryclinic.com /

-

Ladningsøvelser for NiCd akkumulatorer:

Chapter 10: Getting the Most from your Batteries:
http://www.buchmann.ca/chap10-page1.asp
Citat: "...
The problem with the nickel-based battery is not the cyclic memory but
the effects of crystalline formation.
...
When NiMH was first introduced there was much publicity about its
memory-free status. Today, it is known that this chemistry also suffers
from memory but to a lesser extent than the NiCd.
...
Tests performed by the US Army have shown that a NiCd cell needs to be
discharged to at least 0.6V to effectively break up the more resistant
crystalline formation. During recondition, the current must be kept low
to prevent cell reversal. [Altså helst hver celle hver sin afladning]
..."
http://www.buchmann.ca/Chap10-page2.asp
"...
Figure 10-3:  Effects of exercise and recondition.
Battery A improved capacity on exercise alone; batteries B and C
required recondition. A new battery with excellent readings improved
further with recondition.
..."
http://www.buchmann.ca/Chap10-page3.asp
"...
With charge only (charge-and-use), the annual percentage of battery
failure on the USS Eisenhower was 45 percent (see Figure 10-4). When
applying exercise, the failure rate was reduced to 15 percent. By far
the best results were achieved with recondition. The failure rate
dropped to 5 percent. Identical results were attained from the USS
George Washington and the USS Ponce.
..."

/Glenn

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