On Tue, 02 Dec 2008 14:22:56 +0000, Invisible <voi### [at] devnull> wrote:

>
>All different versions of Acer TravelMate. None of them are young any 
>more. (Maybe 2, 3 years old?) A few of them will run on battery power 
>for, like, 20 minutes. But none are very reliable. Apparently they were 
>when new.

Rechargeable batteries are funny things before Li-ion batteries, the best thing
you could do for them was is to "work" them. That is charge and completely
discharge them regularly. With Li-ion batteries that does not work and in fact
it is counter productive. Li-ion batteries can be kept on charge all the time, I
believe.
You might be able to put some new life into your old laptop batteries by
discharging them completely then charging then again a couple of times but if
your laptop shuts off immediately on switching the power off then I fear that
they are goosed.
-- 

Regards
     Stephen

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