Sony VGN-FS Series - Manual (Page 24)

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Getting Started
4 Slide the lock switch (1) to the LOCK position to secure the battery on the computer.
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When the computer is directly connected to AC power and has a battery pack installed, it uses power from the AC outlet.
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Certain rechargeable batteries do not meet Sony quality and safety standards. For safety reasons this notebook only functions with genuine Sony
batteries designed for this model. When inserting another kind of battery, the battery will not be charged and the notebook will not function.