Dell Inspiron Mini Duo (1090, Late 2010) - Manual (Page 29)

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Using Your Inspiron 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 battery health meter key 2. on the function key row on the keyboard.
In the 3. Battery Life tab, select the Disable battery charging check box.
NOTE: Battery charging can also be disabled in the System Setup (BIOS) utility.