What's your charging patterns and are you using the charger that came with the phone? the Battery that comes in the phone is a big one and requires at least 4 to 8 of solid charging all of my phone I pull them down to 1% then I shut them down and I use the Charger that came out of the box it puts out 1150mA of power to the phone which with that big battery is more than enough.. as for the battery getting the maximum out of it make sure no apps are running in the back ground press and hold the static button that is right of the home button and look at the apps running swipe to the right or left to have them stop running.. There's allot of apps on these phone now that are there for purpose but some of them are a nuisance and choosing which to go is up to the Individual but for me I use the ones that are going to befit me..
This is a Very Good App <> System Panel App <> it comes in a Free version and a paid version minus the Apps I have the paid version it tells me all the Vitals on my phone, CPU usage, apps running, non running, battery level, CPU and battery Temperatures in Celsius or Fahrenheit..
Hope this helps b33
I have facebook as well it can keep your phone a hopping at time sometimes all day with text and pictures. b