Kelsey Wow thanks for the info. I bought some nice used IBM Thinkpads and the salesman said it was normal for old batteries to only last about an hour.
If Thinkpad batteries are cheap I may just get a couple new ones. Chris On Mon, Jun 12, 2006 at 04:29:32PM -0700, kelsey hudson wrote: > [EMAIL PROTECTED] wrote: > >What if I have laptop plugged into an outlet? Battery > >should last years doing "echo -n mem .." then right? > > Lithium-ion batteries have little-to-no memory effect. The > worst thing you can do to a lithium ion battery is deep- > cycle it. That is, run it all the way down, then run it all > the way back up. The main killer of lithium ion batteries > is, funny enough, time. lithium ion batteries have a shelf > life. They have a predictable capacity loss profile. If you > keep the battery 100% charged, you'll permanently lose > approximately 20% of the battery's capacity per year (given > normal environmental conditions). The best way to keep your > battery fresh and capacity as high as possible is to keep it > cold and keep it at a sub-100% charge. For instance, at a 40% > charge level, you only lose 2% total capacity per year at 0 > degrees C. Note that this is different from the self-discharge > rate -- lion batteries typically discharge at a rate of 5% > per month (or so) almost regardless of temperature. > > so, the short answer is: no, that won't have any effect on > how long your battery lasts. If you want your battery to last, > take it out of the machine at 40% charge and put it in the > freezer. Then, when you want to use it, pull it out and let > it thaw, charge, then use it. Inconvenient, wouldn't you say? > > such is the life of batteries :\ > > -kelsey > > > -- > [email protected] > http://www.kernel-panic.org/cgi-bin/mailman/listinfo/kplug-list > -- _______________________________________ Christian Seberino, Ph.D. 1579 MORENA BLVD #C15 SAN DIEGO, CA 92110-3748 Phone: (619) 573-4233 Email: [EMAIL PROTECTED] _______________________________________ -- [email protected] http://www.kernel-panic.org/cgi-bin/mailman/listinfo/kplug-list
