What you should know

When the first low-power message appears, the screen dims automatically to save power.

If you continue to work without plugging in the power adapter or changing the battery, the computer displays a second low-power message.

The second message is followed by a third and final message indicating that the computer is about to put itself to sleep. Within a few seconds, the computer goes to sleep automatically to protect the contents of RAM. All activities are interrupted. It’s a good idea to save your work when you see the first two low-power messages to make sure you don’t lose information.

If you continue working until the computer goes to sleep automatically, you can wake it again as soon as you plug in the power adapter or replace the battery with a charged battery.

If you can’t plug in the power adapter, the contents of RAM are retained in sleep for about a day (as long as you don’t remove the battery).

IMPORTANT Recharge a depleted battery as soon as possible. Leaving a depleted battery in the computer for a length of time (especially in a hot location, such as the trunk of a car) may damage the battery so that it can’t be recharged. If this happens, you need to replace the battery.

Using the battery icon

There is a battery icon in the menu bar that tells you the charge left in your battery.

The amount of black in the icon indicates the charge level.

When a lightning bolt appears

in the icon, the battery is charging.

Power Management

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Apple 3400 Series manual Using the battery icon, What you should know