Good points, newkidd. Finding the root cause is critical. However, I'd like to add that just because Display or Cell Standby is the top battery user at any given point in time is not necessarily a bad thing.
For example, if you were to unplug your phone in the morning but then forget it on the kitchen table when you leave the house for the day (No, I've never done that!), you'd see that Cell Standby was the top battery user for the day. But that's expected with a properly running phone that sat all day with 0 usage.
On the other hand, if you did nothing on your phone all day but turn it on every 5 minutes to check the time and then turned it back off, then Display would be the top battery user. Doesn't mean there's something wrong with the display or settings. At least not if your battery still lasts a full day. It just means the display was on a lot.
However, if your battery is down to 20% after only 2 hours, something is definitely wrong. Tunein is a streaming audio app, right? When you use it, are you in a good 3G (or 4G) coverage area? If the phone is having difficulty keeping a strong data signal then a streaming service could definitely eat up more battery than normal. How long does your battery last when you don't use Tunein? Or have you tried using it while connected via wifi instead of cellular data?