Change Power Adapter preferences on a Mac notebook
Use Battery System Preferences to set options that control your computer’s power adapter and energy use.
Note: Some of the options may not be available, depending on your Mac.
To open these preferences, choose Apple menu > System Preferences, click Battery, then click Power Adapter.
Show battery status in menu bar
Displays the battery’s charge level in the menu bar.
“Turn display off after” slider
Drag the slider to set the amount of time your computer or display should wait before going to sleep while plugged into a power adapter.
Prevent computer from sleeping automatically when the display is off
Keeps the computer from going to sleep when the display sleeps.
Put hard disks to sleep when possible
Puts the hard drive to sleep whenever the computer is inactive.
Wake for network access
Even in sleep mode, wakes to provide access to shared resources, such as shared printers or Music playlists.
Enable Power Nap while plugged into a power adapter
Backs up with Time Machine, and checks for email, calendar, and other iCloud updates while in sleep mode and plugged in.
Automatic graphics switching
To extend the life of your battery, switches automatically between graphics modes.
Restores all your preferences to the default options.