Opladning af batterier

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":

"memory"-effekt eksisterer:

Isidor Buchmann: Memory: Myth or fact?:

2.9) Does the memory effect exist?:

Nyere adresser er måske her:

-

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:

"... 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. ..." "... 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?:

Hovedadresse:

-

FAQ om genopladelige batterier

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". ..."

R/C Battery Clinic:

-

Ladningsøvelser for NiCd akkumulatorer:

Chapter 10: Getting the Most from your Batteries:

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] ..." "... 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. ..." "... 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