On Sun, 2006-07-16 at 02:06 +0300, Micha Feigin wrote: > On Thu, 13 Jul 2006 22:51:03 -0500 Jay C Vollmer wrote: > > On Thursday 13 July 2006 21:24, Carl Fink wrote: > > > I'm not an electrochemist, but modern Li-ion batteries don't develop > > > memory, they just lose capacity each time they're charged. > > > > Isn't what you're describing 'memory?' > > > The end effect may be similar in terms of degraded performance, but the > chemical point of view is different. > > I don't remember the specifics, but IIRC NiCad develop a 'memory' in that the > material 'remembers' it's charged state and won't discharge. It is recommended > to completely discharge these batteries on occasion to avoid this. > > Li-ion don't have this effect, but on the other hand they don't like to be > completely discharged. The problem is that they have several cells, and some > discharge faster then others. When some of the cells completely discharge and > others haven't yet, an effect of back-flow occurs which burns out those cells.
Well, well. I have always tried to completely discharge the battery in my laptop before charging it; maybe I shouldn't. > There is another problem with all batteries, (a problem of the charging > circuits actually) that if they are charged too fast they will over heat which > damages them. The second problem is that none of the batteries like to be over > charged, something which usually isn't handled properly either usually. > > The integrated circuits may get out of sync with the battery (usually when the > battery degrades with age and the circuit isn't calibrated any more, which > causes false information, but doesn't effect performance). It is sometimes > recommended to discharge the battery completely when that happens to > recalibrate > it, but isn't recommended on a regular basis with Li-ions. My laptop's lithium ion had no clue what the percentage was. It would stay between 100 and 50 percent most of the time, then drop suddenly to 0. I read in a Popular Science magazine that freezing a battery may help. I had little to lose as this battery was getting very bad, so I tried it. ...It didn't work. Now the battery will charge, but seems to reset every ten seconds or so; it flashes full and then goes back to <10%. It holds absolutely no charge. It is unfortunate that lithium ion batteries cost so much. To replace this one costs more than what I gave for the laptop. -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
