Sony PCG-FX390P - Manual (Page 35)

Using a Second Battery Pack
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3 When the battery is 85 percent full, the battery indicator turns off.
To remove the second battery pack
If you attach two battery packs, you can remove either of them without shutting
down the notebook.
1 When removing one battery pack, verify that the other battery pack’s
indicator is on.
2 If the indicator of the battery pack you are removing is on, right-click the
battery icon on the task tray and click the “Switch discharge battery” option.
3 Locate the release lever on the bottom of the weight saver.
✍
To charge the battery completely, continue charging for an additional hour. See
“Displaying Battery Information” for more information.
Charging the second battery
✍
To determine the amount of time the battery lasts, see “Displaying Battery
Information” for more information.
Battery indicators