i guess my "may be, may not be" really irritate u then, lol, whatever.
i was just simply saying, if its separable, why cant u change it by yourself then?
Nope... your post didn't irritate me, it just intrigued me.
The current iPod's battery is separable, in that it can be physically removed from the rest of the iPod and replaced if necessary. That doesn't neccessarilly make it user replacable.
For example, the CPU on a MBP is inseparable from the motherboard and is not replaceable. On the other hand the CPU on a Mac Pro is socketed, and therefore removable, but not without some tinkering, and not without voiding your warranty. Apple can certainly do it though, just as they will be able to change the battery out on the iPhone.
On that note here's the iPod battery replacement program: http://www.apple.com/support/ipod/service/battery/ . It costs $65 including shipping.