In the most obvious difference from its predecessors, the 4G iPod carries over the click wheel design introduced on the iPod mini. Some users criticized the click wheel because it does not have the backlight that the 3G iPod's buttons had, but others noted that having the buttons on the compass points largely removed any need for backlighting.

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.


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