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On Sun, 10 Sep 1995, Robert Dewar wrote: > note that, unlike some other laptops, the batteries in the Thinkpad are > NOT "constantly charging", they only charge when they get down to 90%. > It takes FAR longer for them to degrade to this level of charge than it > does to top them up, so only a very small fraction of the time are they > actually charging. > > That's why I think the literature that suggests that constant charging may > be harmful may not be relevant. For what it's worth, 10 months ago, after leaving my battery plugged in and on AC for over a month, it died. It would hold a charge for about 10 seconds. IBM shipped me a replacement which I was babying so it wouldn't happen again. Well, over a month ago I installed Linux and have been leaving the battery in and on AC continuously since then, except for the rundown once every 10 days or so. Last night I took it off AC. After only an hour of use the light got down to blinking orange. This is a TP750 mono with the NiMH battery so I normally get 3-5 hours out of a charge. I'll probably be giving IBM another call soon. This battery has only had about 50 complete power cycles. You guys have peaked my interest, so I'll do a rundown sometime soon. I'd like to not leave the battery in when on AC, but I'd also like to have the battery in as a backup in case of a power failure. ___________________________________________________________________________ John H. Kim "A common mistake that people make when trying to design jokim@mit.edu something completely foolproof is to underestimate the jokim@tuna.mit.edu ingenuity of complete fools." -- Douglas Adams