Is my battery draining fast?

I feel like my iPhone 5s is draining to fast. At 7:00 pm my iPhone was at like 78 now at 9:00 it has decreased from 78 to 28. I've used it only on Wi-Fi

Ya that is pretty fast. Have you been playing games or watching a movie? I know playing games that have good graphics and all like Asphalt 8, Real Racing 3, etc can kill your battery pretty fast. If you haven't been doing anything with it and the battery just drained like that by itself then something is wrong with your phone. You should still be under the 1 year warranty apple gives so go to them if thats the case.

Most of the battery goes towards the background app refresh, if you turn that off (Settings>General>Background app refresh) it will not drain that much battery

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