Sony Vaio PCG-FX203K Instruction & Operation Manual page 24

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Using your notebook
24
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. If the indicator of the battery pack your are going to remove is on, right click the battery icon on the taskbar
and click the switch discharge battery menu.