I found a fix that has definitely worked and I have been dealing with this since October:
I was taking my phone off of the charger at 7am. Using moderately or hardly through the work day and it would be almost dead by 9pm.
After making the changes I will outline, here is my new usage: I charged my phone in full yesterday at 2PM. It is now 24 hours later and I have 19 hours standby and 5 hours usage. My battery is still at 44% which is a major improvement.
What I did:
1. Turned off EVERYTHING in Notifications. You can still receive the reminders for all programs, they just won't cycle through the notification center.
2. Go into your MAIL settings and under FETCH NEW DATA then ADVANCED turn OFF the Cloud and Mail updates from Push to Manual. This is huge. NOTE: This is NOT the normal Push/Manual menu that most of you have already turned off. This is under the ADVANCED menu. Most people don't even see this setting. This setting decides how often the cloud/mail updates. If you leave it on push, it is most certainly draining your battery.
3. I also turned of Govt and Amber alerts, but might not be necessary.
4. I have my mail to fetch manually but that is a personal preference
1 & 2 seem to have been the culprits.
I hope this can at least help someone. It's not the battery life Apple promises, but having my phone at 44% 24 hours after charging it with quite a bit of use is big to me from what it was.