So I have an iPhone 5 that I've had since January 2013. The battery is still the original, but I've rarely had problems with battery life. I charge it overnight and it goes all day until I go to bed usually. All of a sudden it's not even getting to the end of a typical work day. I'm a student so my schedule isn't 9-5, but it shouldn't be at 20% at 2:00 when I unplugged it at 10:00. The only things that have changed recently are the 8.4.1 update a few weeks ago now and some app updates. Facebook has always been a battery suck, but I don't leave it running in the background. In fact, I close apps when I'm not using them (namely to save on data), no background app refresh, and location is pretty much only set for certain apps when I'm using them. What is causing this sudden drop in battery life?! Could it really be just the fact that my phone is 2 1/2 years old and has gotten a lot of use? I don't think it qualifies for the battery recall, and in outside that window anyway, I think.