I just finished operating on my iPod Mini.
A few weeks ago, I got a battery replacement kit. So I spent some time today opening it up, causing some scrapes, but it's okay. When I got it working, I charged it for a few hours.
The reason why I changed the battery was because of the previous battery's inability to hold a charge more than 2 hours of continuous use. (So it sucks when riding planes.)
So that prompted me to get a new battery which is supposed to be the newer generation of batteries for iPod Minis.
I'm now crossing my fingers to see if this will hold the charge more than 6 hours. We'll see. :-)