Sony PCG-FXA49 - Manual (Page 29)

Using a Second Battery Pack
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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 notebook with battery power. When
using two battery packs, the battery pack you insert first charges first. The battery
pack you insert second begins charging when the first battery pack is 85 percent
full. You can monitor which battery pack is charging by observing the battery
indicators.
To insert a second battery pack
1 If another device is in the multipurpose bay, remove that device.
2 Insert the battery pack into the multipurpose bay.
If the battery is being used, the battery 2 indicator turns on.
3 Attach the weight saver to the notebook to stabilize the battery pack. See
“Using the Weight Saver” for more information.
Second battery in multipurpose bay
Battery pack
Multipurpose bay
VAIO logo facing down