I'm not sure what is going on then. When I charge my s3 (about a year and a half old) with the supplied charger it says its charging (although it takes a long time) and after it is "fully" charged my battery barely lasts until noon... HOWEVER when I use my nexus 7 charger (2amp) it charges much faster, and the battery easily lasts all day. I have just noticed this trend recently and have been testing it all week and cant figure it out. Another tidbit, if I am using my s3 charger and playing with my phone, it is charging slower than I'm using it and will die. I am not running any power hungry apps or anything. Everything I have said has been true for both untouched, unmodified stock ROM, before and after factory reset. And my new Candy-Kat Rom. Anyone have any ideas?