My iphone5s battery goes down within 6hrs even after full charge.

Performed diagnostic tests and no HW issues found. But I can see crashes on coretime bugtype 156 daily genrated. Anyone knows the solution.

Already tried restore from itunes and icloud. Also tried reset from genral settings (Erase all content and settings) But still I am facing the issue.

Observed this issue after upgrading to ios8.4

Thanks in advance for the support!