Windows 7... no cpu undervolting... conservative custom power settings - 4+ hours at about 40% brightness before battery went from 100% to about 20 something.
Windows 10... cpu undervolted... same conservative custom power settings - Little less than 2 hours at about 40% brightness before battery went from 100% to 20 something.
Along with core parking, both CPUs were limited to 80% and so no turbo power either.
Seems like windows 10 is playing a major power hog :-(
Now now... before anyone says anything... I had Windows 7 on my laptop for about 10 days before I switched back to Windows 10. Both 7 and 10 were clean non Acer windows builds downloaded from microsoft site.
LIKE - if helpful
ACCEPT - if helped resolve
---------I am not an Acer employee.
Your issue could get better coverage and more answers if posted in forums than in a message to me.
User benchmark: https://www.userbenchmark.com/UserRun/10977437