Apple designed iPod with an internal lithium ion battery that users cannot easily get at to replace. Like most lithium-ion batteries, the iPod battery lasts roughly 500 full recharge cycles. In other words, the battery will continue to have a useful life through the equivalent of five hundred complete discharges and recharges; through time and use, the life of the battery will generally decrease until eventually it does not hold a charge for very long. Apple has published guidelines on its web site for maximizing the life of an iPod battery.

The 4G iPod is slightly smaller in size than the 3G, and it introduces the ability to charge the battery over a USB connection. Currently, the 4G is available at 20 GB, costing $299. The 40 GB, $399 model was discontinued in February 2005.


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