4Open the computer display and press the power button to turn on the computer.
power button
NOTE: Do not connect the computer to the docking device until the computer has been turned on and shut down at least once.
Battery Performance
CAUTION: Before you begin any of the procedures in this section, follow the safety instructions located in the Product Information Guide.
NOTE: Batteries for portable computers are covered only during the initial
For optimal computer performance and to help preserve BIOS settings, operate your Dell™ portable computer with the main battery installed at all times. Use a battery to run the computer when it is not connected to an electrical outlet. One battery is supplied as standard equipment in the battery bay.
NOTE: Battery operating time (the time the battery can hold a charge) decreases over time. Depending on how often the battery is used and the conditions under which it is used, you may need to purchase a new battery during the life of your computer.
Dell Precision Mobile Workstation M20 Quick Reference Guide
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