IPhone 5 battery draining really fast? - 2

I've got my iphone 5 for an about 6months now. And since few weeks it has been acting funny, the battery life is draining so fast… Battery last for about 3~hours. & i barely even use it.Battery drops extremely fast like few percentages within 10~20mins. I went to the genius bar and they run diagnostic test and they said everything seems fine. I don't know what to do?! Any advice/help would be appreciated!

IPhones are notorious for bad battery life. Apple should replace the phone and your service provider might as well. You should take it to your provider's store and tell them about it.

Turn the brightness down and close out apps running in the background.

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