Sony VAIO VGN-CS - Manual (Page 22)

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Getting Started >
Using the Battery Pack
4 Push the battery pack down into the compartment until it clicks into place.
5 Slide the battery LOCK switch outward to secure the battery pack on the computer.
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When your computer is directly connected to AC power and has a battery pack installed, it uses power from the AC outlet.
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This computer is designed to operate only with genuine Sony battery packs.