Help Battery drain issue 5.1.1

[prempreet]

Hi I am using nexus 6 and after upgrading from 5.0 to 5.1.1 i am facing battery draining issue and also screen black outs during outgoing and incoming call both

 

[chanchan05]

It could be a problematic update. You may need to do a factory reset. Would that be feasible?

 

[ekyle]

What does it say is utilizing most if the battery in the battery info? Screenshot maybe?