The operation of the battery is mostly controlled by the power
management settings in Windows XP. As the Service Pack provided manyenhancements for the operating system, this may also include the
settings for the power management. If these settings are altered by theservice pack, this issue may be caused by these changes. There is one
way to reset the settings for resetting the defaults is by reinstall
Power Management. To do this, perform the following steps:
1. Click Start, Control Panel, Performance and Maintenance, and then
>> System icon.
>> 2. This opens the System properties window.
>> 3. Select Hardware tab and click Device Manager.
>> 4. Click "+" beside System devices.
>> 5. Select ACPI Power Button.
>> 6. Right-click the device and select Uninstall.
>> 7. Restart the system.
>> Windows will detect and install the power management on restarting.
John (senior tech) email@example.com