My iPhone started losing battery quickly. What should I do?

A few days ago, my Iphone 4s started losing battery very quickly. Last night it was at 83%, all applications were closed and then this morning it had lost all power and turned off. I already made the 20 changes in Settings that are supposed to use less battery and this is still happening. I think this is an issue with the phone. What should I do?

Replace the battery.

Try completely draining the battery and fully charging, you could also try restoring it. If that fails then you will need to replace the battery

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