iPodHacks has a review of PDASmart’s iPod battery replacement kit.
“Using the plastic tools provided, I was able to pop open the iPod in about a minute, without any marring to the iPod itself. Once open, it was a matter of removing the old battery and simply replacing it with the new. Much more straightforward than I had pictured. Once in place, the iPod came alive (the battery happened to have a bit of charge to it as shipped), I popped the metal shell back in place, and plugged it in for a full charge. So far I’ve used it for most of a work-day in the office and it’s still at 4-ticks on the battery meter. Good as new. Wow – what a difference!”