Sony PCG-FX390P - Manual (Page 34)

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5 Slide the lever toward the front of the notebook to lock the weight saver. See
also “Using the Weight Saver” for more information.
To charge the second battery pack
Keep the battery pack in the notebook while it is connected to AC power. The
battery automatically charges as long as the notebook is connected to AC power
and turned on. The battery indicator flashes while the battery is charging.
To charge the battery pack
1 Connect the AC adapter to the notebook.
2 Insert the battery pack.
The notebook automatically charges the battery. The battery indicator
flashes in a double-blink pattern as the battery charges.
Using weight saver for second battery cover
Battery pack
Weight saver