15 minutos - 1 hora
Battery didn't hold charge
Very well -- the iPod works very well with the new battery (I haven't confirmed the supposed additional capacity). The plastic take-apart tools were a great help. The only problem was pulling the old battery out of the case -- Apple used some fairly sticky adhesive and I needed a fair amount of force and the help of the tools to pry the battery out. Glad I didn't break anything.
Be careful in prying out the old battery to avoid damage to adjacent parts. Perhaps pulling very hard by the wires is the best and safest policy.