Dell Inspiron 8500 - Manual (Page 48)

48 Using Batteries and Module Bay Devices
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2 If the computer is connected to a docking device (docked), undock it.
See the documentation that came with your docking device for
instructions.
3 Slide and hold the battery-bay (or module-bay) latch release on the
bottom of the computer, and then remove the battery from the bay.
Installing a Battery
Rotate the battery into the bay until the latch release clicks.
For more information about installing the second battery, see page 52.