Hi guys, I've been having some battery issues with my iPhone 4S for over a year and a half now. The battery would deplete really fast and the phone would switch off at ~ 24% or less. At first i thought i had to calibrate the battery. I did that 2/3 times but nothing changed. So i recently decided to change the battery thinking that there may be an issue with the battery itself. Still, nothing changed. I'm still having the same issue. On standby it would last a day with ~35% remaining. But whenever i use it (music/photo/games/instagram, etc..) the battery would drop by at least 10% in less than 5 minutes. Is there some kind of hardware issue with the iPhone itself?