The always-on feature called Connected Standby in Windows 8 has been updated for Windows 10. Modern Standby, as it is now known, has support for HDD-based PCs and allows you to disable WiFi during Sleep which will help preserve battery life. Windows 10 also includes easier controls for preventing applications to run in the background and for controlling notifications which also extend to a new Battery Saver mode. I’ve tested the features on a couple of Windows 10 devices (upgrades) and the results have been extremely varied. This Windows 10 feature needs more work but it’s a huge potential advantage to mobile battery life when compared to Windows 8.