[. . . ] Replacing the battery requires four basic steps: · Turn off the computer or put it in sleep mode. Note: A video version of the replacement instructions is available at http://www. info. apple. com/installparts Tools Required No tools are required for this procedure. About Batteries Battery and Dual Battery Support When the external power adapter is not connected, your computer draws power from a PowerBook battery in the battery bay or expansion bay. [. . . ] Note: A video version of the replacement instructions is available at http://www. info. apple. com/installparts Tools Required No tools are required for this procedure. About Batteries Battery and Dual Battery Support When the external power adapter is not connected, your computer draws power from a PowerBook battery in the battery bay or expansion bay. You can also insert a second battery in the expansion bay to double the amount of battery life. Monitoring Battery Charge Level You can determine the charge left in your battery by looking at the battery level indicator lights on the battery itself. The charge can be checked whether the battery is in the PowerBook or not. A lighted circle indicates that the battery has power; an unlighted circle indicates lack of charge. The indicator lights remain lit for a few seconds after you press the battery level indicator button. Open the Date & Time control panel to correct the date and time. For More Information on Your PowerBook Battery Additional information is available in Mac Help. Choose Mac Help from the Help menu and search for "battery. " Apple Computer, Inc. Under the copyright laws, this document may not be copied, in whole or in part, without the written consent of Apple. The Apple logo is a trademark of Apple Computer, Inc. , registered in the U. S. Use of the "keyboard" Apple logo (Option-Shift-K) for commercial purposes without the prior written consent of Apple may constitute trademark infringement and unfair competition in violation of federal and state laws. [. . . ] The Apple logo is a trademark of Apple Computer, Inc. , registered in the U. S. Use of the "keyboard" Apple logo (Option-Shift-K) for commercial purposes without the prior written consent of Apple may constitute trademark infringement and unfair competition in violation of federal and state laws. [. . . ]