Sony Vaio PCG-FX501 Instruction & Operation Manual page 24

Using your notebook
Using the second battery pack
You can purchase a second rechargeable battery pack. With two battery packs, you can extend the time 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.
Inserting the second battery pack
To insert a second battery pack, proceed as follows:
1 If the weight saver is in the multi-purpose bay (1), remove the device.
2 Insert the battery pack (2) into the multi-purpose bay.
The battery 2 indicator light turns on.
3 Attach the weight saver (3) to the computer to stabilize the battery pack.
4 Slide the eject lever on the bottom of the weight saver toward the front of the computer to lock it.
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