Hi there!
Would to know, how aproximatly can i use OS on Lenovo ideapad laptop?
With windows i can do some light work about 3hr.
Also compare with Kali distr, it worth with battery life?
Thx.
depends on your usage 
running a T440s i7 6 cell battery and gives me appr. 3 hours - have no idea what battery gives me in Windows.
you can also have a look on powertop if you are unhappy with your battery lifetime
config is the same as in ubuntu
If you’re running a VM through windows, you can always set up Power Plans this being Performance, Battery Saver, Balanced.