RussellMc wrote:
>> The battery issue is for safety. Read up on failure modes of LiIon
>> battery packs. It certainly doesn't stop cheap replacements.
>>     
>
> Certainly LiIon have more than their fair share of exciting halt and
> catch (literally) fire modes*, but I'm not aware of any major LiIon
> failure mode that increases as the cells age and lose capacity. It's
> more likely that this is a  "what the market will bear" attempt.
>   
I've heard conflicting reports.

maybe the issue is that eventually the risk of thermal runaway due to 
over discharge or in-ability to charge is increased when capacity is 
very low due to age or large number of cycles. I can't find the paper I 
was thinking of.

Anyhow, in practice you can buy 3rd party  PSU brick or battery pack for 
just about any Laptop/Netbook in last 10 years.
Though I'm puzzled why an Acer Travelmate battery is 60 Euro (not that 
old of Laptop) and a higher capacity battery for Dell Inspiron 8200 is 
24 Euro (> 10 year old laptop).
> *  HP issued a recall notice on some
> laptop LiIons a few months ago, it added to an existing list and they
> added some more a few weeks ago. I own a "Compaq" laptop and an HP
> netbook so receive  related notifications.
>
>
>
>                 Russell
>   
Someone offered me 500 to 1000 LiPoly 24V packs withdrawn due to faulty 
regulator design. I declined :) Even though maybe free*.
I was told that "most of the LiPolys are likely OK" But how would I 
test? And I'd have to design my own replacement electronics. I don't 
want to sell Incendiary Bombs (even though I'm from Norn Iron orignally).

The company that has these now ships battery packs with "fixed" design 
of Electronics. I have to ask myself why are they not putting these 
batteries in the new electronics if they are perfectly OK. Allegedly the 
issue was not charging but regulation to the load (I guess maybe 6 
cells, which of course is more like 13V to 27V than 24V?)

(* is the offer a cunning waste disposal scheme? and the shipping on 500 
to 1000 battery packs... :( )


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