Using the MacBook Battery
When the MagSafe power adapter isn’t connected, your MacBook draws power from its
built-in battery. The length of time that you can run your MacBook varies, depending
on the applications you use and the external devices connected to your MacBook.
Turning off features such as AirPort Extreme or Bluetooth
®
wireless technology and
reducing screen brightness can help conserve battery charge—for example, when
you’re traveling by air. Many of your system preferences are automatically set to
optimize battery life.
If the battery runs low while you’re working, connect your power adapter and let
the battery recharge. You can check the amount of battery charge left by viewing
the Battery (
) status icon in the menu bar. The battery charge level displayed is
based on the amount of power left in the battery with the applications, peripheral
devices, and system settings you’re currently using. To conserve battery power, close
applications and disconnect peripheral devices not in use, and adjust your Energy
Saver settings.
For more information about battery conservation and performance tips, go to
www.apple.com/batteries/notebooks.html.