Why doesn't my iphone4 charge?

Ever sins I downloaded a battery saver app from the app store my phone hadn't charge I could leave it over night from 3% and when I wake up in the morning to see if it has charged it's only at 18%.It also turns off when I unplug it and when its in my pocket, I don't know if it turns off because the battery doesn't work anymore or if its because the back of my iPhone is cracked.

If you dropped your iPhone and then it stopped charging that same day, its cause you dropped it. Its most likely not the app unless you jailbroke it. If you have enough battery reset the phone (full off and back on) and try again, if that doesn't help try restoring and if that doesn't work, your iPhone may be taking its last breaths

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