On Mon, 17 Jul 2006 12:57:01 -0500 Owen Heisler <[EMAIL PROTECTED]> wrote:
> 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. > Try looking for batteries on ebay. I got an oem replacement from china for 65$ including shipping (took about 10 days). Locally they cost about 200$. The old one was lasting about 40 minutes this one goes for over 4 hours (i rarely go below 50% actually). It also claims to store more juice then it's rated for. Don't know if that value is true though. > -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
