Sony Vaio Notebook User Guide for PCG-FX120/FX120K, PCG-FX140/FX140K, PCG-FX150/FX150K, PCG-FX170/FX170K, PCG-FX190/FX190K Using a Second Battery Pack You can purchase a second rechargeable battery pack. With two battery packs, you can extend the time that you use your computer with battery power. When using two battery packs, the battery pack you insert first charges first.

The battery pack you insert second charges when the first battery pack is 85 percent full. You can monitor which battery pack is charging by observing the battery indicator lights. To insert a second battery pack..

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