Sony VGN-TZ10 Series User Manual page 25

To use the battery care function
You can select your desired maximum charge level with the battery care function to reduce battery degradation.
1 Click Start, All Programs, and VAIO Central.
The VAIO Central window appears.
2 Double-click Power Management and Battery Care Function.
3 Click to select the Enable Battery Care Function check box.
4 Select the desired maximum charge level.
5 Click OK.
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Getting Started