I had been using mine this week at work to stream music via Spotify for about 1 1/2 hours each morning, then do the basics like checking email, FB, Twitter, etc. By the end of my 8 hour shift, I was in the low 50's%. Today I have not streamed any music, but stuck with the basics and after being off the charger since 9am, I am sitting at exactly 50% at 7:30pm. Not too bad. Just a note though, I do have Juice Defender Ultimate installed as well. 
