I deliberately let the phone running a movie last night and managed to get it down to 1%. I turned the phone off and let it charge overnight for 7 hours. As expected, it was 100% this morning.
BUT, two hours later the battery is 93%. My screen brightness is around 30% and I haven't had it on for more than 30 minutes. I'm going to have to keep a close eye on this, good thing there is such a long warranty.