pietcux
Headphoneus Supremus
I got my new replacement battery and soldered it on the pcb without any problems. It was a bit difficult to remove the old battery without applying to much strenght/strain on the battery because the tape of it is very strong, but I got it done without damaging any parts. Walkman works again.
Congrats, this will help me in the future for sure. This spare parts dealer page rather informative though. The Main board assy for the ZX1 is available, but it costs 516€ plus 19% VAT. And one ear pad for my beloved Z7 is only 100€ + VAT. Available, but not cheap.
http://eu.eetgroup.com/Guide/m/Sony-Network-Walkman-NWZ-ZX1