Sony pcg-fx905p User Manual

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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.

To insert a second battery pack, proceed as follows:

If the weight saver or the floppy disk drive is in the multi-purpose bay (1), remove it (see 

Insert the battery pack (2) into the multi-purpose bay.
The battery 2 indicator light turns on.

Attach the weight saver (3) to the computer to stabilize the battery pack.

Slide the eject lever on the bottom of the weight saver towards the front of the computer to lock it.

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  If you attach two battery 

packs, you can remove one of 
them without shutting down 
the computer. When removing 
one battery pack, make sure 
that the other battery pack 
indicator is on.