Sony Vaio PCG-FX601 User Manual page 27

Using your notebook
Removing the second battery pack
To remove the second battery pack, proceed as follows:
1 Slide the eject lever on the bottom of the weight saver, in the direction of arrow 1.
2 Slide the release lever on the bottom of the computer in the direction of arrow 2.
3 Remove the weight saver.
4 Pull out the battery pack.
5 Reinsert the weight saver.
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