Rechargeable lithium-based technology currently provides the
best performance for your Apple notebook computer, iPod, iPhone,
or iPad. You can also find this standard battery technology in
many other devices. Apple batteries share the characteristics
common to lithium-based technology in other devices. Like other
rechargeable batteries, these batteries may eventually require
replacement. Lithium-ion polymer batteries have a high power
density that gives you a long battery life in a light package.
And you can recharge a lithium-ion polymer battery whenever
convenient, without requiring a full charge or discharge cycle.
Most lithium-ion polymer batteries use a fast charge to charge
your device to 80% battery capacity, then switch to trickle
charging. That’s about two hours of charge time to power an iPod
to 80% capacity, then another two hours to fully charge it, if
you are not using the iPod while charging. You can charge all
lithium-ion batteries a large but finite number of times, as
defined by charge cycle.