Apple iPhone (For iOS 6.1) - Manual (Page 35)

Chapter 3 Basics 35
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 off or is in sleep or standby mode.
The battery icon in the upper-right corner shows the battery level or charging status.
Charging Charging Charged Charged
Display the percentage of battery charge: Go to Settings > General > Usage and turn on the
setting 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, 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 one of the low-battery
images appears.
or or
Rechargeable batteries have a limited number of charge cycles and may eventually need to
be replaced.
Replace the battery: The iPhone battery isn’t user replaceable; it can be replaced only by an
authorized service provider. See
www.apple.com/batteries/replacements.html .