The battery life of my iPhone 6s Plus has been absolutely terrible. I took my first back to the Apple Store and they said there were absolutely no issues with it whatsoever that they could see, but replaced it for a completely new phone out of good will, but it hasn't made a blind bit of difference.
I saw an earlier post here saying 9.1b5 was better on battery life than 9.0.2 and took a punt to install the public beta incase it made any difference and, while I think it has made some difference, it's certainly not right by any means.
I don't play games at all on my device - I don't even have any installed - and don't watch streaming media extensively... just use 'normal' phone operations, browse Safari and Twitter (using Tweetbot 4) and my battery's currently at 18% remaining after 5hrs, 7mins of usage and 26hrs, 56mins on standby.
I have to think that it could only be a software-related issue, as what are the odds that two completely separate phones could have the exact same issue? I have Background App Refresh turned off completely, as well as Wi-Fi Assist.
Does this sound normal?