Mine was draing rather quickly also and I don't play any music, but I do use the browser a bit and some texting. within a few hours (maybe four) battery was down to 15%. Tech support says it is the battery, so I went to Sprint Store and they gave me a new battery and so far it seems to have made some difference, but I haven't used the phone very much today since I have taken it off the charger.
I also been reading from other forums that it may be a software issue that reads the battery and may be just not reading the battery level accurately as others have said they too get down to 15% rather quickly also but can continue for several more hours before the phone actually shuts down, but even if it is a software/hardware issue the battery shouldn't run down to nothing that quickly so hopefully they will come out with an update to take care of the battery drain if that is what the problem is.