IPhone 4 had 30% battery then 10mins later dead flat

Hi,
My mums iPhone 4 with iOS 5.1.1 had 30% battery left this morning then 10mins later I tried calling her and it rang out and went to voicemail.. 5mins later she noticed phone was unresponsive and had a black screen and pressing buttons wouldn't do anything oh and she didn't feel the phone vibrate or ring when i was calling... so after pressing both unlock circle and top button and putting on charge it appeared the phone had lost all battery power.
So the phone went from 30% to 0% in a matter of 15mins?
We think the phone may still be under apple 1yr warrant but not sure. But any else experienced this issue and is there any I can do or should it be taken back to apple to look at?

You may have been deceived by the battery power indicator.  They are notoriously inaccurate, so it is very likely that the battery had considerably less power than "30%".  I don't think this is an issue you need to worry about.  Just charge it up and move on.

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