iPhone has an internal, lithium-ion rechargeable battery.
Charge the battery: Connect iPhone to a power outlet using the included cable and USBpower adapter.
Note: Connecting iPhone to a power outlet can start an iCloud backup or wireless iTunessyncing.
Charge the battery and sync iPhone using a computer: Connect iPhone to your computerusing the included cable. Or connect iPhone to your computer using the included cable and theDock, available separately.
Unless your keyboard has a high-power USB 2.0 or 3.0 port, you must connect iPhone to aUSB 2.0 or 3.0 port on your computer.
Important: The iPhone battery may drain instead of charge if iPhone is connected to a computerthat’s turned off or is in sleep or standby mode.
The battery icon in the upper-right corner shows the battery level or charging status.
Display the percentage of battery charge: Go to Settings > General > Usage and turn on thesetting under Battery Usage.
If you charge the battery while syncing or using iPhone, it may take longer to charge.Important: If iPhone is very low on power, it may display one of the following images, indicatingthat iPhone needs to charge for up to ten minutes before you can use it. If iPhone is extremelylow on power, the display may be blank for up to two minutes before one of the low-batteryimages appears.
Rechargeable batteries have a limited number of charge cycles and may eventually need tobe replaced.Replace the battery: The iPhone battery isn’t user replaceable; it can be replaced only by anauthorized service provider.