How does changing batteries for your iPod work?

I have an iPod, and I know you have to change batteries sometime. How does it work? How much does it cost? Will you lose your memory on your iPod? Where do you go to change it? etc.How does changing batteries for your iPod work?
I had to replace my iPod battey recently and went to Batteries Plus, they replaced it for me very quickly.



Here is a link to their website:

http://www.batteriesplus.com



They have a lot of stores nationwide, there might be one near where you live.



They also got videos online that teaches you how to do it yourself, for example this video:



http://www.youtube.com/watch?v=n_v32xLH8

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