Every time a new build of Windows 10 is released - or leaks, as in this case - there are always small changes that show incremental improvements as Microsoft pushes closer to the final feature set for the OS. In this case, we can see a few improvements to Battery Saver...

In 9888, we can see that the UI has been updated and more importantly, it's now working properly. In the previous builds, while we could see Battery Saver, it was not functional...
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