[ltp] battery update

[FeRD]

Do you actually have a 72W power supply for your T22? I bought mine 
used, and it was supplied to me (I discovered) with a 56W IBM power 
supply. Apparently the 56W unit will power the ThinkPad fine, but it 
sure did a number on my battery. (Also explains why the battery I 
received the laptop with was a complete brick, I bet.)

I actually want to try and rebuild the brick-battery (ala the iPod 
battery rebuild projects that people have talked about on various 
more-guts-than-money websites), since I have a spare which is still 
minimally functional and the brick is effectively dumpster-fodder as is. 
But I'd need a 72W power supply to avoid killing the rebuild, or there's 
no point to the project. Plus, to be honest, I just can't figure out how 
to get the damn thing open! I peeled off all the label stickiness on the 
underside, and I'm still trying to figure out where to pry/push/poke to 
get it to pop apart. I was hoping for hidden screws under the label, but 
apparently it's strictly a snap-together job. I'm sure IBM intended it 
to be a one-way assembly. You'd think they'd have planned for me! (Or 
maybe they did...) ;)

If anyone's ever gotten a Txx-style battery open and knows the secret 
password, please let me know! :)

-FeRD

David Smith wrote:

>So after further investigation it appears my T22 doesnt charge the
>batteries properly. Neither the new battery from titannotebook nor the ibm
>battery that came with it charged right, they both seemed to loose
>capacity at every cycle.
>
>I just ran the IBM battery through three cycles with my maha universal
>charger, which discharges slowly and charges Li-Ion slowly, it took about
>10 hours to fully charge the battery.  The IBM battery was down to 22 Wh,
>and had ~180 cycles on it. I remember when I first received the the
>laptop, maybe 15 cycles before, the ibm battery had closer to 35 Wh.
>Result: The IBM Battery is now at 38.13Wh with a design capacity of 43.20.
>
>So it appears something is wrong with the charging circuit on the laptop,
>not sure if its the power supply or not.  I went through the hardware
>diagnostic document supplied by IBM and the only test I havent done is the
>voltage output on the power supply.  I have a feeling maybe its weak and
>not supplying 72 watts which a voltage test on the power supply will not
>indicate.
>
>The other tests in regards to the laptop all indicate stuff like the
>charge light doesnt come on, basically that the charge circuit doesnt work
>at all, and that the system board should be replaced if thats the case.
>
>Anyway I got a two battery charger on ebay for about $20 shipped so once I
>Get my hands on that, I'll see how well it charges. IMHO if it doesnt
>charge right, its very likely a power supply problem. If it does charge
>right, I'll need a new system board (If I care, since I'll have a charger
>;)
>
>
>-- dave
>
>
>  
>