Apple 200 Series manual Power Management, Power sources, Responding to low-power messages

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Read this chapter for information

about your PowerBook’s battery.

5 Power Management

Power sources

Your computer can draw its operating power from two different sources.

mMain battery Your computer’s main power source is a nickel-metal-hydride (NiMH) battery. The battery provides power for about 2–7 hours of work time (depending on the PowerBook model and type of battery you have and the battery conservation features you choose).

mAC power You can run your computer from a grounded electrical outlet by plugging in the power adapter.

Your computer also has a backup battery that maintains the contents of RAM while you replace the main battery. The backup battery does not provide enough power to run the computer.

These power sources are described in more detail in the following sections.

Responding to low-power messages

When the batteries run low, the computer displays a series of low-power messages. The work time remaining after you see the first message varies depending on how you are using the computer. It’s a good idea to act promptly.

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Contents User’sGuide Apple Computer, Inc Contents Connecting Additional Equipment Power ManagementIndex Communications regulation information Vcci statement Power On button Power adapter port Plugging in the computer Getting StartedWhen you are ready to begin Opening the display Turning on the computer Problems turning on your computer? Chapter What’s next? Learning the basics Tutorial are highlighted, then release the trackball button Reviewing the basics Turning the computer off Automatic sleep Putting the computer to sleepRestarting a computer that’s already on User’s Guide Where to find answersGetting Help Getting answers to your questions Getting answers with the Topics button Now continue with the next section Getting answers with the Index button Read and follow the instructions in the window Getting answers with the Look For button If you want to close Macintosh Guide, click here Tips for using Macintosh Guide Identifying objects on the screen Main Macintosh Shortcuts window appears Learning useful shortcutsClick one of the category buttons Connecting Additional Equipment PowerBook Duo Dock and Duo Dock Connecting Additional Equipment PowerBook Duo MiniDock Connecting a printer PowerBook Duo Floppy AdapterSee the documentation that came with the modem Connecting a modemExternal modem is ready to use Terminator Connecting Scsi devicesHDI-30 Scsi Using your PowerBook as a Scsi diskConnecting your computer as a Scsi disk Turn on the PowerBook by pressing the power button Simplifying the connection process Quitting Scsi disk mode Adding memory to your computer Connecting other devicesInstalling application programs Installing and Using Application ProgramsFinding out which programs are open Switching programsWorking with several programs at a time Hiding and showing windows on the desktop Backing up your filesPage Responding to low-power messages Power ManagementPower sources What you should know What you should doRecharging in the computer Recharging the batteryRecharging in a recharger Place the battery in the recharger as shown Recharging in both the computer and a recharger Removing or replacing the batteryReplacement batteries come with a door attached Disposing of dead batteries Replacing the backup batteryReconditioning the battery Following appears Maximizing work time Page Health-related information about computer use Appendix a Health, Safety, and Maintenance TipsMusculoskeletal discomfort Arranging your work area and equipment Eye fatigueKeyboard and trackball Mouse What about electromagnetic emissions? Avoiding fatigueImportant care and safety instructions Appendix a Caring for batteries Handling floppy disks Traveling with the PowerBook Service and support Storing the PowerBookAppendix B Using Your Keyboard Control key Index Index Disk Tools disk 53 display. See also screen Index Index Index Index See Scsi Y, Z Apple Computer, Inc