Battery installed perfectly...but one tip I could make
30 minutos - 2 horas
After several years, the battery on my iPod Classic 160 had naturally lost its capacity.
Smoothly...exactly as the directions said.
Make sure the new batteries cable makes a good connecting when locking it back in place. Since you have to bend the new cable to try and match Apple's case, it sometimes has a little "springiness" to it that can make it hard without three hands :D to keep it in place while you use the Spudger to re-lock it.
I had my entire iPod back together for a day before I realized it had no battery capacity. Opened it back up and, sure enough, I didn't have the cable re-locked (popped up in fact the minute I reopened the case).
Reseated it, now the iPod (including it's battery life) are good as new!