battery pcb reanimation

[gnurbs]

hi,

I'm doing some modding to extend battery life on my X40. The battery that came with the unit was sort of dead with 4Wh remaining so I got some 18500 cells i glued together to an 8-cell battery that is about the size as the 4cell standard battery, just adds some 2 mm to laptop height. Very nice, sadly the whole thing just does not work. The wiring is alright as far as i can tell. I used a 4 cell pcb (the one that came with the 4 cell battery, original ibm one). The correct Voltage is available on ground, VBat and the three cell monitoring connectors. The second row of cells runs without monitoring. This should be fine since the cells have in-cell over/undervoltage-protection. But the result is: there is no voltage on the battery connector.

So has anyone here done similar? Any ideas how to fix this?

I read this thread http://forum.thinkpads.com/viewtopic.php?f=18&t=79048, started a new one since that one is a bit old... if this is against board policy, please excuse me.

regards, gnurbs