On Tue, 2 Dec 2008 16:05:37 +0100, "scott" <sco### [at] scottcom> wrote:

>> 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.
>
>Don't you need to maintain a minimum level of battery power in a Li-Ion in 
>order to stop it completely killing itself?  I believe if you drain one 
>completely then you might as well just chuck it in the bin.  Maybe this 
>happened somehow due to a bad battery control circuit in the laptop?
> 

I really don't know. It has been a very long time since I worked in the real
world. Most of my experience has been with lead acid and Ni-cads. I have ruined
a few older laptop batteries by leaving them on charge but you can overcome that
a bit by flattening them a couple of times.
-- 

Regards
     Stephen

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