Dell Latitude D810 - Manual (Page 14)

If Dell QuickSet is installed, press <Fn><F3> to display the QuickSet Battery Meter.
The Battery Meter window displays status, charge level, and charge completion time for the battery in your computer.
In addition, when your computer is connected to a docking device (docked), the Battery Meter window includes a Dock Battery tab, which displays the charge
level and current status of the docking device battery.
The following icons appear in the Battery Meter window:
For more information about QuickSet, right-click the icon in the taskbar, and click Help.
Microsoft Windows Power Meter
The Windows Power Meter indicates the remaining battery charge. To check the Power Meter, double-click the icon on the taskbar. For more information
about the Power Meter tab, see " Power Management ."
If the computer is connected to an electrical outlet, a icon appears.
Charge Gauge
Before you insert a battery , press the status button on the battery charge gauge to illuminate the charge-level lights. Each light represents approximately 20
percent of the total battery charge. For example, if the battery has 80 percent of its charge remaining, four of the lights are on. If no lights appear, the battery
has no charge.
Health Gauge
The battery operating time is largely determined by the number of times it is charged. After hundreds of charge and discharge cycles, batteries lose some
charge capacity, or battery health. To check the battery health, 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 " for
more information about the battery operating time.
Low-Battery Warning
A low-battery warning occurs when the battery charge is approximately 90 percent depleted. The computer beeps once, indicating that minimal battery
operating time remains. During that time, the speaker beeps periodically. If two batteries are installed, the low-battery warning means that the combined
charge of both batteries is approximately 90 percent depleted. The computer enters hibernate mode when the battery charge is at a critically low level. For
more information about low-battery alarms, see "
Power Management ."
NOTE: You can use your docking device to charge a computer battery. However, a battery in a docking device does not power the docking device or
computer.
The computer or docking device is running on battery power.
The computer is connected to AC power and the battery is charging.
The computer is connected to AC power and the battery is fully charged.
NOTE: When you press and hold the status button on the battery charge gauge for at least 3 seconds, the charge-level lights will first light to display
the current charge status. Then they switch to Health status where they represent incremental degradation when lit.
NOTICE: To avoid losing or corrupting data, save your work immediately after a low-battery warning. Then connect the computer to an electrical outlet.
You can also turn the computer off and install a second battery in the module bay. If the battery runs completely out of power, hibernate mode begins
automatically.