User's Manual

Chapter 3 Basics 41
Charge and monitor the battery
iPhone has an internal, lithium-ion rechargeable battery. For more information about the
battery—including tips for maximizing battery life—see www.apple.com/batteries.
WARNING: For important safety information about the battery and charging iPhone, see
Important safety information on page 170.
Charge the battery. Connect iPhone to a power outlet using the included cable and USB
power adapter.
Note: Connecting iPhone to a power outlet can start an iCloud backup or wireless iTunes
syncing. See Back up iPhone on page 175 and Sync with iTunes on page 17.
You can also charge the battery by connecting iPhone to your computer, which also allows you
to sync iPhone with iTunes. See Sync with iTunes on page 17. Unless your keyboard has a high-
power USB 2.0 or 3.0 port, you must connect iPhone to a USB 2.0 or 3.0 port on your computer.
Important: The iPhone battery may drain instead of charge, if iPhone is connected to a computer
that’s turned o or is in sleep or standby mode.
See proportion of battery used by each app. Tap Settings > General > Usage, then tap
Battery Usage.
The battery icon in the upper-right corner shows the battery level or charging status. To display
the percentage of battery charge remaining, go to Settings > General > Usage. When syncing or
using iPhone, it may take longer to charge the battery.
Important: If iPhone is very low on power, it may display an image of a nearly depleted battery,
indicating that iPhone needs to charge for up to ten minutes before you can use it. If iPhone is
extremely low on power, the display may be blank for up to two minutes before the low-battery
image appears.
Rechargeable batteries have a limited number of charge cycles and may eventually need to
be replaced. The iPhone battery isn’t user replaceable; it can be replaced only by an Apple
Authorized Service Provider. See www.apple.com/batteries/replacements.html.
Travel with iPhone
If you travel outside your carrier’s network area, you can avoid roaming charges by turning o
voice and data roaming services in Settings > Cellular. See Cellular settings on page 176.
APPLE CONFIDENTIAL
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