Il Mio Problema
The battery doesn't work perfectly and was old. Also the new iPod battery that ifixit sell have more mAh so I've decided to change it.
La Mia Riparazione
The repair was long and I was been careful. At the end the iPod worked perfectly and the battery give me more hours.
Il Mio Consiglio
I have an important advice about the ground strap: I've read that somebody asked if that ground strap was required: no! I lost it but I have repaired the iPod without problem.