Why does my iPhone 5s die so fast?

During school I get to school around 8:45am and its 100% and when I leave 1st period which is 9:00-10:35 it's at 88%? And when I'm going home it's at 20% I barley use it I turn the brightness down and close all my apps and it still dies fast and i barley use it anyway to solve this solution?

If your cellular data is on, and your phone is not connected to your schools Wi-Fi, it continues to search for signals all day. It happens with me as well, and I keep my brightness down to the lowest level. Plus, if you use it a lot as well, it kills the battery. Try and bring a charger, so in between classes you can charge it, that is, if you're allowed.

Try turning it off when you aren't using it, or at least lock it and turn the brightness all the way down.

Yeah, get a Samsung

A cell phone battery can be charged between 300 to 500 times. If you have charged your phone between 300 and 500 times, you need to replace your cell phone battery

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