Dell Precision M60 - Manual (Page 24)

For more information about removing the second battery, see " Using the Module Bay ."
1. Ensure that the computer is turned off, suspended in a power management mode, or connected to an electrical outlet.
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 latch release on the bottom of the computer, and then remove the battery from the bay.
Installing a Battery
Slide the battery into the bay and lower the battery until the latch release clicks.
For information about installing the second battery, see " Using the Module Bay ."
Storing a Battery
Remove the battery when you store your computer for an extended period of time. A battery discharges during prolonged storage. After a long storage
period, recharge the battery fully before you use it.
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CAUTION: Before performing these procedures, turn off the computer, disconnect it from the electrical outlet, and disconnect the modem from the
telephone wall jack.
NOTICE: If you choose to replace the battery with the computer in standby mode, you have up to 90 seconds to complete the battery replacement
before the computer shuts down and loses any unsaved data.