IPhone 4S switches off at low battery levels

Hello everyone,
My iPhone 4S with less than 2 years is having problems. It powers off when it reaches (not so) low battery levels. It happened at as high as 16% of battery, and although it mostly happens when I try to open apps like Facebook or the Camera, it has happened also with stuff like the Phone app. It gets even worse, because although it still has more than 10% battery charge, the only way to power it up again is by pluging it to the transformer.
Could this be battery related or is this a know iOS issue? I have been really careful with the battery since day one, so I would expect not to have such problems. It's really annoying, because I now have 85% of battery usage, not 100%, and I never know when it's going to power off next.
Can anyone relate to this? Any suggestions about what I should try to fix it?
I'm on the latest update of iOS 7.
Thanks a lot!

The best way to test the battery and make sure the level being displayed is as correct as it can be is to let the battery die completely, then plug it in to charge to 100% without using it. After that, see when it powers off. You can also make an appointment at the Genius Bar at Apple or your Authorized Apple Service Provider and they can test your battery.

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