Sony PCG-GR250 - Manual (Page 43)

Using a Second Battery Pack
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To remove the second battery pack
If you attach two battery packs, you can remove either of them without shutting
down the notebook. When removing one battery pack, make sure that the other
battery pack’s indicator is on. If the indicator of the battery pack you are
removing is on, right-click the battery icon on the taskbar and click the “Switch
discharge battery” option.
1 To remove the battery pack, first slide the multipurpose bay Release lever in
the direction of the arrow to unlock the weight saver.
2 Remove the weight saver, and then pull out the battery pack.
3 Reinsert the weight saver. See “Using the Weight Saver” for more
information.
Multipurpose bay Release lever
Release lever