How long does a iphone 4 battery last with ios 7?

Like i like to listen to music all day in school so i'd say that's moderate use

You're going to burn through your battery life pretty quick if you're streaming music through your cellular plan. If you're connected via Wi-Fi, you can get probably 5-6hours along with moderate use.

Well its rated to do 40 hours of music playback, of course it would depend on the age/cycles of the battery as well.

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