Why does my iPhone 4 shut off below 15% battery life?

I noticed my iPhone 4 battery was getting low today. I was given a message at 20% life. I then let the phone drop down to 15%.
I received a phone call, in which the call dropped. After I pressed the Sleep button, I was not able to wake the phone. Instead,
I had to plug it in for about 3 minutes, and Sleep/Wake + Home buttons to restart the device.
Is this just a miscalibration with my battery? Or is this some sort of defect. Other than this issue, my battery life has been fine and the device has been working as expected.

hi CiChirs, could be two circumstances. that the battery is completely consumed and then the iphone  is off, this is due to applications or  updates. I had an iphone 4 for a long time and battery worked within normal limits. so check applications or settings of your iphone.
if the iphone is taking off with power, then you most likely have a short circuit, check the dock connector with a clean brush.
i hope it help.
Regards/Saludos

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