Sony VGN-SZ4MN/B User Manual page 25

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