Ok so recently I noticed that the battery on my iphone seems to run out a lot quicker then normal. Since I bought this(around sept. or oct) I never really abuse the battery by charging it constantly or everyday. I charged it on avg. every 2 days. I just test the battery full charged and on standby, it would be at around 50% in 2 days of no use. By the third day the battery is completely drained! Not even at 20% or 10%. Now this is with relatively little or no use. anyone know what might be the problem? I'm not sure if I could even take it to apple since its unlocked and all.