If your iPod requires service only because the battery’s ability to hold an electrical charge has diminished, Apple will replace your iPod for a service fee of $59, plus $6.95 shipping. Customer ship their iPods to Apple, and Apple will ship back an equivalent replacement iPod with a new battery.
Other sites are offering replacement batteries for as little as $29.
The competitive marketplace for iPod replacement batteries is making battery life a minor issue for iPod owners.