Dell Latitude D820 - Manual (Page 5)

4. Disconnect your computer and all attached devices from their electrical outlets.
5. Turn over the computer.
6. Remove the battery.
a. Slide the battery-bay latch release on the bottom of the computer toward the back of the computer until the latch is engaged.
b. Grasp the battery by the battery tab and slide the battery horizontally toward the side of the computer.
c. Lift to remove the battery from the bay.
7. Press the power button to ground the system board.
8. Remove any installed ExpressCards, PC Cards, or smart cards from the computer.
Computer Orientation
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NOTICE: To avoid damaging the system board, you must remove the main battery before you service the computer.
1 battery 2 battery-bay latch release
1 front 2 left 3 back 4 right