Thank you for the guide!
My ipod ran through the washing machine and the dryer, the battery appeared to be unable to charge. So I changed it with the guide.
I was able to change the battery at the step 17, I skipped the step 13 and 15, and I could have skipped 9 to 11 with the headphone jack.
It was not easy to pry the different parts and to seat back the LCD cable at the end, be patient!