User Guide

Chapter 2 Basics 33
Unless your keyboard has a high-powered USB 2.0 port, you must connect iPhone to a
USB 2.0 port on your computer.
Important: iPhone 3G cannot be charged with a FireWire power adapter or FireWire-
based car charger. If iPhone is connected to a computer that’s turned o or is in sleep
or standby mode, the iPhone battery may drain.
An icon in the upper-right corner of the screen shows battery charging status.
Charging Charged
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
Maximizing Battery Life
iPhone uses lithium-ion batteries. To learn more about how to maximize the lifespan
and battery life of your iPhone, go to www.apple.com/batteries.