Please help Samsung Galaxy ace 11 GTS7560M Battery issues

A

AC Question

I am not very tech savvy...I have had this phone for a year and a half and had no issues. All of a sudden the battery indicator light doesn't seam to be displaying the proper battery percentage. It says its charged at 100 % but dies in 5 minutes and shuts off. When i plug it in its saying its charged at 100%. The battery always lasted for days before it needed a charge now all of a sudden its bad.
 

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