Hi,
Heads up. If you purchase any product of Samsung mobile phone from an international distributor eg Kogan. Samsung Australia will NEVER service the mobile. This means, unlike apple (who will), if you need a new battery the only way to have it done is send it back to the source country. Please avoid any and all international sellers if you plan on keeping the phone longer than the average battery life, of 2 odd years with these phones or simply accept that when the battery doesn't last the day, you are up for a new phone.
well there are after market repairers that will change it for you