[ltp] t22 battery problems??

[David Smith]

joy! thanks for the reply.

-- dave

Ted Frater said:
> David Smith wrote:
>
>>Ok so a while back I posted about problems with my thinkpad and
>> batteries.
>>
>>I'm running Windows XP. (yes i know its a linux list ;P)
>>
>>I did a full battery cycle with a universal charger and the original ibm
>>battery comes back to about 37 of the "NEW" battery 43 watt hours
>>capacity.
>>
>>Actually I did a complete discharge and my universal charger/conditioner
>>indicated almost 4 amp hours of depleted capacity.
>>I then let it charge somewhat. Windows reported the 37 wah capacity and I
>>let it charge the battery to 100%.
>>
>>I unplugged the laptop, and within a minute it goes from 100 to 0%. What
>>gives?
>>I bought an aftermarket replacement and it doesnt charge right either.
>>
>>I seemed to get longer life under linux although I'm not sure if thats
>> due
>>to usage differences.
>>
>>Anyone help? :)
>>-- dave
>>
>>
>>
>>
> When laptop makers went from simple lithium ion batteries without  on
> board firmware to sense battery charge cycles age and  condition
>  to batteries with asll of the listed controls they made them as it was
> describerd at the time, fail safe.
>  this means that the onboard firmware will effectively shut the battery
> down  even when there a lot of life left in it for the following reasons.
> 1. to protect the laptop  electronics inc the charging circuits and dc
> to dc converter as well as the cells in thebattery
>  Older laptops didnt have this on board firmware and give much longer
> battery life than the newer ones.
> so theres nothing you can do apart from buying another proper T 22
> battery which youll find will work ok .
>  there was a time when the 600 range of Thinkpads had serious lithium
> ion battery failure rates, but IBM wouldnt admit there was a design
> fault with the firmware.
> As for the aftermarket battery being duffas well. My guess is that its
> just a coincidence.
>  youve 2 dead batteries.
>
>
>
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