My Surface Book shipped with one Power Plan = Balanced. Whoopee. Which meant that I was getting an expected battery life of 4-5 hrs when fully charged. I could create new Power Plans, but found that these were not provided with all the power options - such as the processor speed controls. Research indicated that this was because the SB ships with Connected Standby turned ON, which appears to (a) hide the Power Saver and High Performance Plans and (b) disallow many more advanced power config options. This article below that if you turn Connected standby OFF in the Registry, you can then have full access to the other plans, copy one or both to a new name and adjust as required (with full options), and THEN TURN CS back ON - or (as I discovered) you lose the Sleep options altogether. I now have a Max Battery option showing c 10+ hrs battery life...just thought I'd share. Unauthorized link removed PS. Obviously, the need to go through this rigmarole to unleash full battery life is ridiculous.