Why is my battery life

Why is my Samsung galaxy note 3 battery from 80% suddenly dropped to 0% n turned off itself (just been fully charged n surf Internet only 10 min. Didn't receive 15% auto warning n 5% auto warning message). I immediate changing my phone again and it showed me battery 80% .
Looks like my phone has wrongly detected actual battery % n thought battery 0% n turned it off.

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sound problem
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