iphone 6s battery

Hey there. Just upgraded form 5s (iOS 8.3) to 6s (iOS 9.2). As many users I have the battery drain issue.

I deactivated background app refresh, limited location services and push emails, used brightness at around 50%. Still getting the impression that it drains faster than it should drain.

I read that it may be corrupt data from my previous phone (I restored via iTunes) and setting the phone up as new and then restoring from iCloud should solve the problem.

What do you guys think ? Looking forward to your answers. Thanks.