Dell XPS 15Z (L511Z, Mid 2011) - Manual (Page 44)

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Using Your XPS Laptop
Disabling Battery Charging
You may be required to disable the battery charging feature while on an airplane flight.
To quickly disable the battery charging feature:
Ensure that your computer is turned on. 1.
Press the <Fn><F3> keys on the keyboard. 2.
In the 3. Battery Status window, click Turn off Battery Charging and then click OK.
NOTE: Battery charging can also be disabled in the System Setup (BIOS) utility.