Mine hasn't lasted a full day since i got it? i'm use to it n doesn't really bother me? I charge it sometimes 3 times a day n now i have a "ted baker portable charger" look one up on ebay for about 15 quid gives u at least 2 full charges when out n about, charger in my van n plugged in when i'm at home.
All i can say is get over it! the battery isn't good enough for the phone n theres nothing you can do about it except charge it all the time