Unfortunately I live in Italy, and a single Cyclon costs about 15€!, opening the battery should be easy.

Tried slightly heating up the hybrid, still no change. I also took a look a the analog input of the Power Manager chip, and the battery level displayed by the computer is related to the voltage present on that pin (from +2V to almost +4V). If there is a problem, it has to be in hybrid or in the components attached to it.

Also, what is the purpose of Q11? mine looks slightly darker than the others.

And just to make my life a little bit happier, the hard drive died... (Yes, I did clean the melted rubber before even trying to turn it on, in fact that drive worked for about three days)