Iphone 5 batterie

Bonjour,
J'ai un probléme avec ma batterie de mon Iphone 5 qui a un peu plus d'un an.
Il me reste généralement 20% de batterie et il s'éteind et depuis quelques jours il se décharge en 3h avec aucune application ouverte.
Pouvez vous me dire quelle peut etre le probléme?
Le SAV d'apple peut-il faire quelque chose?
Merci de votre aide.
Alban

This probably won't help but my phone did the same thing today.  I took it back to the Sprint store and it charged there.  I've been charging it all day and it's finally at 98%.  But I don't think its normal.  With little use, my iPhone 5 will last all day.  And if i leave it uncharged overnight it will last all night unless i'm less than 50% when I go to sleep.

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