Chapter 2. Charging and Conserving Battery Power
Nothing is more frustrating than wanting to use your iPhone and finding that it has run out of battery power. To help prevent this problem, this chapter explains how your iPhone's battery works and how you can modify your iPhone settings to minimize power usage, thereby extending the daily life of your battery.
Your iPhone runs on an internal, nonremovable lithium-ion battery, which you'll need to recharge periodically, depending on how often you use your iPhone. Unlike other mobile phones, you cannot remove your iPhone's battery and replace it with a spare, fully charged one.
Like all batteries, your iPhone's battery will eventually wear out, but by then you'll probably have a new iPhone model anyway ...
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