Galaxy S3 battery problem

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http://forum.xda-developers.com – Hi my galaxy S3 is having a problem with its charge. Sometimes when I charge it it gets really hot, but still goes to a hundred percent. But once I unplug it it changes to a lower number like 30%, then 100%, then stays at another value like 65%. anyone else have similar problems? or solution. Im using sonic R6 with trinity. Never had issues prior. Edit: the battery is losing its charge really fast, meaning the percentage is dropping quickily (HowTos)