I want to buy a spare backup battery for my galaxy 4g epic touch but I saw a comment on the charger/dock station (comes with battery) that said the battery did not work because it was not a NFC battery. I can't find solid facts on this subject. They said that there was some kind of antenna on the battery and the battery is programmed to the phone it came with. There was also many saying that they had to hard reset their phones after switching batteries. Please help guys. I am an extremely heavy user and have always had a backup battery to get me through my work day. I need one right away but I don't need problems. Thank you.