iPod 4th Generation or Photo Battery
Biggest trouble I had was step one. I actually broke the edge off the large tool. A note somewhere else on this site recommended using a razor which work far more easily then the large blue tool. Common sense, your using a sharp razor, be careful!
As previously noted the screws are TINY, very easy to lose of you drop one.
I jockeyed the battery to get just a crack of space and then used the spluger tool to pry the battery free from the adhesive, very strong.
My IPOD is currently recharging for the first time in years. :o)