On Mon, 22 Nov 2004 12:29:35 -0500, luth-astro{at}earthlink.net wrote:

>Since starting this thread I've bought a battery and done the upgrade
>successfully.  But a new question has come up.  Given a 100% charge
>(according to the onscreen indicator), how much should a Li-Ion battery
>lose when not connected to anything?  That is, out of the laptop, laying
>on a wooden desk.

About 1% per day is normal.

>More important, with it in the computer, does one have to watch the
>charge and disconnect the AC adapter when it gets to 100%.

No, the ThinkPad circuitry monitors the charge. It stops when reaching
100%, and restarts when the charge falls below 95%.

>I ask because I read something in the ThinkPad manual that said charging
>will not _start_ until the charge has dropped to 95%, to avoid
>overcharging.  It seems to me ludicrous that such a system would not
>have overcharge protection.

It is mainly to avoid damaging the battery by frequent recharge cycles.
If a machine sits on the table unused but is connected to AC supply, the
current approach warrants the battery will only be bothered by
recharging every five days, not daily, which could turn detrimental in
the long-term.

Li-Ion batteries are extremely sensitive (mine has degraded in 3 years
of shelf life + 1.5 years of very occasional use). I would prefer a
NiMH-powered TP760/765 if it was about traveling with the computer.




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