Why does my iPhone 4s always turn off at 6%?

My iPhone 4s always dies and turns off when it hits 6%, never at 1%… Not sure why? I figured it was just bad battery, but just want to be sure.

Mine never waits till 1% either. It turns off at 3 or 4% I guess it just depends. Not sure why they do this:/

It may because you have so many apps running in the background that it can't make it to 1%… Like, it couldn't close all of those apps in time and what not so it just starts shutting down at 6%.

Why does Injustice turned off

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