Sony VGN-TT11LN/B User Manual page 27

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Getting Started
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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.
!
Certain rechargeable batteries do not meet Sony quality and safety standards. For safety reasons this computer only functions with genuine Sony
battery packs designed for this model. If an unauthorized battery pack is installed, the battery will not be charged and the computer will not function.