What could be causing my iPhone to not be holding a charge?

It's an iPhone 4, and I've had it a few months short of two years. I've taken good care of it, it's got plenty of memory, updated software, I'm not running many apps (I double click the home button to close them often), but my phone's battery won't last at all lately even when I don't use it very often.

The battery is probably wearing out; they don't last forever. The same thing happened to a friend's iPhone 4 after a couple of years. Find a local phone repair store that will put in a new battery - it cost my friend about $30.

Your expensive non replaceable battery could be the problem.switch to android, you can easily buy cheap 5 to 15 dollar batteries on eBay or amazom and replace them for FREE at home.

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