My situation is as follows.
1) Never had any battery issues (iPhone 5s) until upgrading to iOS9.
2) Since the upgrade my battery drains in around half a day with limited usage.
3) App battery usage Top 5 in last 7 days (in order) Mail, Podcasts, Home & Lock Screen, Safari, Messages (all native iOS Apps) - accounts for 65% of all usage, indicting it is not an external App problem.
4) Have always taken care of my battery - never overcharging or letting battery run down too low. This coupled with descriptions of other people's experience indicate that it is not a physical battery problem.
5) Have no Exchange account linked to mail.
6) Girlfriend's iPhone 5c also has erratic and extreme battery drain since upgrading.
I think your refusal to acknowledge that this might have anything to do with iOS9 is utterly ridiculous to be honest. I've tried several of the purported solutions and none have worked. And sure, we could all backup, fresh install, manually add apps back, upload music/photos again etc.etc. to try and fix this. But we really shouldn't have to should we. I'm sure a lot of people don't have the time either. It should just work without drastically deteriorating the battery of many users. Like every other major iOS upgrade that I have performed in the past.
There may not be 20,000 posts on the forum (maybe there are, I have no idea) but a cursory look at the internet shows that this is a real problem that many many people are experiencing following the upgrade from iOS8 to iOS9.