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RT Surface users had trouble upgrading to Windows 8.1. The last item on the complaint list is that some users experience a reduction in battery life when upgrading their RT Surface to Windows 8.1.
Users who have updated from Windows RT Preview now have a number of problems with their device batteries. Users who upgraded Surface RT from Windows RT 8.1 Preview to Windows RT 8.1 have noticed a decrease in battery life.
During the update, the wireless adapter power policy is not migrated. Instead, the power policy is set to a default value that consumes more power during operation and in connected sleep mode, Microsoft explains.
To reset the wireless adapter power policy to the correct settings, open an administrator prompt, type the following command and press Enter:
Enter the following, then press Enter:
This migrates the wireless adapter power policy and should solve the problem.
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