IPhone 4 battery problem

I have an IPhone 4, So when I had updated to iOS 7 my IPhone's battery level was normal it would go to 1% and turn off but now my phone goes to either 69% or 80% and turn off and it would say it's completely dead, and tell me to plug it into a charger. I do that and it starts to turn on and when it turns on it will sometimes say 5% and I will leave it there for 3 minutes and it says 100% ? Or sometimes it will start back at 60% what should I do to stop this problem? Help because my phone won't last a whole day without it turning off

It may be the battery or another fault

as a starting point you might consider disabling all apps that may be running in the background

double tap the home button and scroll through apps and close all that you don't need running (which will be almost all of them)

You just need a new battery. They're a lot easier to replace than the ones in the Iphone 3s. There are kiosks in all the malls that will do it in ten minutes.

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