Having mobile data and wi-fi finder (scanner) always ON, there is your problem. Those 2 things are among Top 5 most battery drainers, not just here on WP, but on Android and iOS too. Bad reception is another battery drainer, since your phone is trying harder at that time to connect to a cell tower. The harder it tries, the more battery will drain.
Let's make a test. In the next week or let's say 10 days, try to keep mobile data and wi-fi scanner turned OFF. Only use them (turn them ON) when you need them, even if that happens 3-5 times per hour. When you need internet and you don't have a wi-fi spot to connect, turn the mobile data ON, finish what you have to finish online and then turn it OFF. Same goes for the wi-fi too. When you find a wi-fi spot, keep mobile data OFF and just use the wi-fi spot. When you finish, turn it OFF. Everything else you have just leave it as it is now (bg tasks, email settings etc.). Monitor closely your battery life in the next week or 10 days and see what results you will get.
And by the way, your post is kinda OFF topic, but it's ON topic too, cuz you are expecting new firmware from Samsung, so, your post is ON topic
P.S. Turning your mobile data (internet) off, will NOT turn your phone reception off (the radio part).