So my iPhone 4 is JB and until two days ago the battery was fine and now all of a sudden i can get about 4-6 hours out of a full charge. Not really using it. Just sitting in my pocket. So what is going on. I will do a restore and see but why did this happen? Does not seem like it should just start happening all of a sudden. Also the phone is a new refurb from apple that they warrantied to me. So i do not think the battery is toast.