My new iphone died, altough it was fully charged

I have only been using my iphone 4s for 4 days, and yesterday it died. The battery was fully charged and i was using it only minutes before it died. When I checked my phone minutes later I could not turn it on and the iphone felt very hot. I tried charging it today and after a while it started charging again, but now at 5%. What could have happened? Should I send it back?

Send it back. Just in case.
better safe than sorry!
i think maybe the battery was just fried. Its better to just send it back.

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