Sony PCG-GR390K - Manual (Page 36)

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36
To charge the second battery pack
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 the printed Quick Start for more information.
Using weight saver for second battery cover
Charging the second battery
✍
To determine the amount of time the battery lasts, see “Displaying Battery
Information” for details.
Battery pack
Weight saver
Battery indicators