Dell Inspiron 640M - Manual (Page 39)

Using a Battery
39
Check the Battery Health
NOTE:
You can check battery health in one of two ways: by using the charge gauge on the battery as described
below or by using the Battery Meter in Dell QuickSet. For information about QuickSet, right-click the icon in
the taskbar, and click Help.
To check the battery health using the charge gauge, press and hold the status button on the battery
charge gauge for at least 3 seconds. If no lights appear, the battery is in good condition, and more than
80 percent of its original charge capacity remains. Each light represents incremental degradation. If five
lights appear, less than 60 percent of the charge capacity remains, and you should consider replacing the
battery. See "Specifications" on page 157 for more information about the battery operating time.
Low-Battery Warning
NOTICE:
To avoid losing or corrupting data, save your work immediately after a low-battery warning, and then
connect the computer to an electrical outlet. If the battery runs completely out of power, hibernate mode begins
automatically.
By default, a pop-up window warns you when the battery charge is approximately 90 percent depleted.
You can change the settings for the battery alarms. See "Configuring Power Management Settings" on
page 41 for information about accessing QuickSet or the Power Options Properties window.
Conserving Battery Power
Perform the following actions to conserve battery power:
• Connect the computer to an electrical outlet when possible because battery life is largely determined
by the number of times the battery is used and recharged.
• Place the computer in standby mode or hibernate mode when you leave the computer unattended for
long periods of time. See "Power Management Modes" on page 39 for more information about standby
and hibernate modes.
• Use the Power Management Wizard to select options to optimize your computer’s power usage. These
options can also be set to change when you press the power button, close the display, or press
<Fn><Esc>. See "Configuring Power Management Settings" on page 41 for more information on
using the Power Management Wizard.
NOTE:
See "Battery Performance" on page 37 for more information on conserving battery power.
Power Management Modes
Standby Mode
Standby mode conserves power by turning off the display and the hard drive after a predetermined
period of inactivity (a time-out). When the computer exits standby mode, it returns to the same
operating state it was in before entering standby mode.
NOTICE:
If your computer loses AC and battery power while in standby mode, it may lose data.