I had an ATT 4S, and I had some decent battery life I guess. I didn't really check it until now. Now I'm with Sprint (4S), and I seems like I have significantly lower battery life. I recently got a replacement phone, and I'm letting it die out today. It's at 1%, and I have 5 hours exactly of full usage, 13 hours of standby. is this good? Average? What do you guys get and what carrier do you use?