Sony PCG-F650 - Manual (Page 52)

Using a Second Battery Pack
51
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
1 If another device is in the multipurpose bay, remove the device.
2 Insert the battery pack into the multipurpose bay.
If the battery is being used, the battery 2 indicator light turns on.
Second battery in multipurpose bay
Battery pack
Multipurpose bay
Label side facing down