IPhone 4S dies super fast and not an accurate batterie percentage?

All of a sudden my iPhone battery dies super fast. If I have it in my pocket and don't use it for an hour or two it will drop about 30%. Also it started dying at around three percent, then ten, then 20 and recently it died in the 40%. My battery got bent a little when I replaced the screen, could this have caused the problem?

I remember that happening to my iPhone 3GS. The battery percentage will drop fast. So i would charge it more often but after that i noticed my phone will die at 85%! What i finally did was replaced the battery after that it worked great. Maybe you should get a new battery for it & see if that works

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