Apple iPod touch iOS 4.3 - Manual (Page 41)

Important: If iPod touch is very low on power, it may display one of the following
images, indicating that iPod touch needs to charge for up to ten minutes before you
can use it. If iPod touch 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
iPod touch uses lithium-ion batteries. To learn more about how to maximize the
battery life of iPod touch, go to www.apple.com/batteries.
Replacing the Battery
Rechargeable batteries have a limited number of charge cycles and may eventually
need to be replaced. The iPod touch battery isn’t user replaceable; it can be
replaced only by an authorized service provider. For more information, go to
www.apple.com/support/ipod/service/battery.
Security Features
Security features help protect the information on iPod touch from being accessed
by others.
Passcodes and Data Protection
You can set a passcode that you must enter each time you turn on or wake up
iPod touch.
Set a passcode: Choose Settings > General > Passcode Lock and enter a 4-digit
passcode, then enter the passcode again to verify it. iPod touch then requires you to
enter the passcode to unlock it or to display the passcode lock settings.
Setting a passcode turns on data protection (iPod touch 3rd generation or later). Data
protection uses your passcode as the key for encrypting mail messages and their
attachments stored on iPod touch. (Data protection may also be used by some apps
available in the App Store.) A notice at the bottom of the Passcode Lock screen in
Settings shows whether data protection is enabled.
41 Chapter 3 Basics