This is a follow-up to Brad's linked post which is locked, recommending setting the processor power on battery setting to 99%.
The one thing his post didn't indicate is what the default processor power setting on battery was before he set it to 99%. My rig has it defaulted to 50%. My simple brain thinks setting it to 99% would increase power consumption and reduce battery life. If the default on his Surface Pro 4 was 100%, setting it at 99% would make sense to increase battery life. Chime in if you see this, Brad.
On a related note, this new rig of mine, a Dell Inspiron 13 7000 with Win10Pro, gets killed by sleep mode. Battery drains far faster when it's in sleep than not. If I prevent sleep, my battery life is 8-9 hours of steady use. Lucky to get 4-5 if it happens to sleep for as little as 30 minutes, so I've found best strategy is to set sleep to never, even on battery. I'd be interested to know if others on Win10 notebooks are seeing similar issues.