Sony PCG-FX240K - Manual (Page 24)

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Keep the battery pack in the notebook while it is connected to AC power. The
battery indicator flashes while the battery is charging. See also “To charge the
battery pack” in your printed QuickStart for more information.
To remove the second battery pack
If you attach two battery packs, you can remove either of them without shutting
down the notebook. When removing one battery pack, make sure that the other
battery pack’s indicator is on. 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.
Charging the second battery
✍
To determine the amount of time the battery lasts, see “Displaying Battery
Information” for more information.
Battery indicators