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The computer calculates the remaining battery charge based on your current rate of power use and other factors such as the age of the battery. What to do when the main battery runs low When the main battery runs low you can: . Plug the computer into an external power source and recharge the main battery . Place the computer into Hibernation mode and replace the main battery with a charged spare Mobile Computing 110 Monitoring main battery power . Connect the computer to an optional high capacity battery (if available for your computer) . Save your work and turn off the computer If you do not manage to do any of these things before the main battery completely runs out of power, the computer automatically enters Hibernation mode and turns itself off. Hibernation mode keeps track of where you were, so that when you turn on the power again, you can continue where you left off. If you have Hibernation mode enabled (the default), the computer copies the details of your open programs and files to the hard disk before shutting down. For more information on using Hibernation, see “Using and configuring Standby mode” on page 77. Setting battery alarms Your computer can be configured to warn you when the battery is running low. You can set multiple alarms. Each alarm can be set to alert you when a specified percentage of remaining battery power has been reached. You can set how the warning occurs: sound an alarm, display a message, both, or none. You can also set the computer to enter Standby mode or Hibernate mode or to completely power down when the alarm goes off. To set an alarm: 1 Click Start, Control Panel. 2 Double-click the Power Options icon. Mobile Computing 111 Monitoring main battery power The Power Options Properties window appears. 3 Click the Alarms tab and set the alarm as desired. (Sample Illustration) Alarms tab in Power Options Properties Conserving battery power How long a fully charged battery pack lasts when you are using the computer depends on a number of factors, such as: . How the computer is configured . How much you use the hard disk, DVD-ROM or multifunction drive, diskette drives, or other optional devices . Where you are working, since operating time decreases at low temperatures There are various ways in which you can conserve power and extend the operating time of your battery: . Enable Standby or Hibernation, which saves power when you turn off the computer and turn it back on again . Use the power schemes in the Power Options Properties Mobile Computing 112 Monitoring main battery power These power-saving options control the way in which the computer is configured. By using them, you can greatly increase the length of time you can use the computer before you need to recharge the battery. These options are combined into preset power schemes that let you choose between maximum power savings and peak system performance. You may also set individual power- saving options to suit your own...

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